available online at www.studiesinmycology.org
doi:10.3114/sim.2011.68.06
StudieS in Mycology 68: 139–162. 2011.
Acremonium phylogenetic overview and revision of Gliomastix, Sarocladium, and
Trichothecium
R.C. Summerbell1, 2*, C. Gueidan3, 4, H-J. Schroers3, 5, G.S. de Hoog3, M. Starink3, Y. Arocha Rosete1, J. Guarro6 and J.A. Scott1, 2
1
Sporometrics, Inc. 219 Dufferin Street, Suite 20C, Toronto, Ont., Canada M6K 1Y9; 2Dalla Lana School of Public Health, University of Toronto, 223 College St., Toronto ON
Canada M5T 1R4; 3CBS-KNAW, Fungal Biodiversity Centre, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands; 4Department of Botany, The Natural History Museum, Cromwell
Road, SW7 5BD London, United Kingdom; 5Agricultural Institute of Slovenia, Hacquetova 17, 1000 Ljubljana, Slovenia, Mycology Unit, Medical School; 6IISPV, Universitat
Rovira i Virgili, Reus, Spain
*Correspondence: Richard Summerbell, rsummerbell@sporometrics.com
Abstract: Over 200 new sequences are generated for members of the genus Acremonium and related taxa including ribosomal small subunit sequences (SSU) for phylogenetic
analysis and large subunit (LSU) sequences for phylogeny and DNA-based identiication. Phylogenetic analysis reveals that within the Hypocreales, there are two major
clusters containing multiple Acremonium species. One clade contains Acremonium sclerotigenum, the genus Emericellopsis, and the genus Geosmithia as prominent elements.
The second clade contains the genera Gliomastix sensu stricto and Bionectria. In addition, there are numerous smaller clades plus two multi-species clades, one containing
Acremonium strictum and the type species of the genus Sarocladium, and, as seen in the combined SSU/LSU analysis, one associated subclade containing Acremonium
breve and related species plus Acremonium curvulum and related species. This sequence information allows the revision of three genera. Gliomastix is revived for ive species,
G. murorum, G. polychroma, G. tumulicola, G. roseogrisea, and G. masseei. Sarocladium is extended to include all members of the phylogenetically distinct A. strictum
clade including the medically important A. kiliense and the protective maize endophyte A. zeae. Also included in Sarocladium are members of the phylogenetically delimited
Acremonium bacillisporum clade, closely linked to the A. strictum clade. The genus Trichothecium is revised following the principles of unitary nomenclature based on the
oldest valid anamorph or teleomorph name, and new combinations are made in Trichothecium for the tightly interrelated Acremonium crotocinigenum, Spicellum roseum,
and teleomorph Leucosphaerina indica. Outside the Hypocreales, numerous Acremonium-like species fall into the Plectosphaerellaceae, and A. atrogriseum falls into the
Cephalothecaceae.
Key words: Acremonium, Cephalothecaceae, Gliomastix, holomorph concept, Leucosphaerina, nomenclature, Sarcopodium, Sarocladium, Trichothecium.
Taxonomic novelties: Trichothecium sympodiale Summerbell, Seifert, & Schroers, nom. nov.; Gliomastix roseogrisea (S.B. Saksena) Summerbell, comb. nov., Gliomastix
tumulicola (Kiyuna, An, Kigawa & Sugiy.) Summerbell, comb. nov., Sarocladium bacillisporum (Onions & Barron) Summerbell, comb. nov., Sarocladium bactrocephalum (W.
Gams) Summerbell, comb. nov., Sarocladium glaucum (W. Gams) Summerbell, comb. nov., Sarocladium kiliense (Grütz) Summerbell, comb. nov., Sarocladium ochraceum
(Onions & Barron) Summerbell, comb. nov., Sarocladium strictum (W. Gams) Summerbell, comb. nov., Sarocladium zeae (W. Gams & D.R. Sumner) Summerbell, comb. nov.,
Trichothecium crotocinigenum (Schol-Schwarz) Summerbell, Seifert, & Schroers, comb. nov., Trichothecium indicum (Arx, Mukerji & N. Singh) Summerbell, Seifert, & Schroers,
comb. nov., Trichothecium ovalisporum (Seifert & Rehner) Seifert & Rehner, comb. nov.
INTRODUCTION
The genus Acremonium includes some of the most simply structured
of all ilamentous anamorphic fungi. The characteristic morphology
consists of septate hyphae giving rise to thin, tapered, mostly lateral
phialides produced singly or in small groups. Conidia tend to be
unicellular, produced in mucoid heads or unconnected chains. They
can be hyaline or melanised, but the hyphae are usually hyaline. A
preliminary study of the phylogenetic diversity of Acremonium by
Glenn et al. (1996), based on partial nuclear ribosomal small subunit
(SSU) sequences, showed that recognised members belonged to at
least three groups in distinct orders of fungi. Most species including
the type, A. alternatum, belong to the order Hypocreales. A smaller
group of species, Acremonium section Chaetomioidea, belongs to the
Sordariales. This section, typiied by the Acremonium alabamense
anamorph of Thielavia terrestris, was conceived as including the
Acremonium-like anamorphs of Chaetomium and Thielavia species
(Morgan-Jones & Gams 1982). A recent study has placed several
of these heretofore unnamed Acremonium-like anamorphs into the
new genus Taifanglania (Liang et al. 2009), based on the type, T.
hechuanensis. Another Acremonium species included by Glenn et
al. (1996), A. furcatum, belongs to an order of uncertain identity.
Subsequent publications have shown that A. furcatum is related to
the well-known phytopathogen Verticillium dahliae and belongs to the
recently established family Plectosphaerellaceae (Zare et al. 2007,
Schoch et al. 2009), which groups together with the Glomerellaceae
in a clade that forms a poorly deined, unnamed, ordinal-level sistertaxon to the Microascales. Several other Acremonium species such
as the phytopathogen A. cucurbitacearum also have been shown
to belong to the Plectosphaerellaceae (Zare et al. 2007). The
simple structure of Acremonium has either convergently evolved
in diverse fungal orders within the class Sordariomycetes or is
symplesiomorphic at a very deep level.
The diversity of fungi throughout the Ascomycota that produce
Acremonium-like anamorphs is high, including genera such as
Gabarnaudia (Microascales), Lecythophora (Coniochaetales), and
Pseudogliomastix (Sordariales incertae sedis). The present study
does not review the vast range of fungi producing simple phialidic
conidiophores, but instead, focuses speciically on: 1) anamorphs
that have been formally placed into the genus Acremonium, and
2) species and genera phylogenetically related to the named
Acremonium species.
The number of previously phylogenetically unstudied fungi is large.
Currently, there are approximately 95 named Acremonium species with
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139
SuMMerbell et al.
traceable material (cultures or specimens in good condition), excluding
endophyte species that were transferred to Neotyphodium by Glenn et
al. (1996). In addition, there are an undetermined number of nectriaceous
teleomorphs with unnamed Acremonium-like anamorphs plus about
15 named and unnamed Emericellopsis species with Acremonium
anamorphs (Zuccaro et al. 2004). The preliminary phylogeny done by
Glenn et al. (1996) includes only seven species that would currently be
considered Acremonium, inclusive of the Acremonium berkeleyanum,
anamorph of Cosmospora berkeleyana, formerly considered the
anamorph of Cosmospora vilior, plus two Emericellopsis species. Clearly,
further work is needed on the phylogeny of Acremonium.
Because of the high biodiversity within Acremonium, relatively
evolutionarily labile, rapidly evolving genes like the ribosomal internal
transcribed spacer (ITS) are not alignable across the genus (de Hoog
et al. 2000) or even within some of the individual orders that the
genus spans. Because many Acremonium species are derived from
relatively closely related families in the Sordariomycetes, relatively
slowly evolving genes that are alignable such as the ribosomal large
subunit (LSU) may yield considerable ambiguity about relationships.
To address this problem, we performed an analysis of LSU and whole
SSU sequences for a larger number of Acremonium isolates than has
been examined previously. Based on these results, we chose six of
the most phylogenetically distinctive species and included them in the
Ascomycetous Tree of Life project (Schoch et al. 2009). The elegant
phylogenetic analysis in that project was based on two nuclear
ribosomal genes, one mitochondrial ribosomal gene, and portions
of three protein-coding genes. These results permitted us to gain a
clearer picture of relationships among the Acremonium groups that
were imperfectly resolved in LSU and SSU analysis.
In the present study we present the results of the LSU and
small subunit (SSU) phylogenetic analyses for the majority of
Acremonium species available in pure culture including described
and undescribed species. This gives not only a phylogenetic
overview of the genus, but also provides identiication-enabling
sequences for Acremonium species that have not been sequenced
previously. Taken with the Tree of Life studies, these results shed
new light on the biodiversity of these morphologically simple fungi
that have long been profoundly problematical in terms of accurate
classiication and reliable species identiication.
Medium (Raper & Raper 1972). The LSU region of ribosomal
DNA (rDNA) was ampliied with primers V9G (de Hoog & Gerrits
van den Ende 1998) and LR5 (Vilgalys & Hester 1990). The SSU
region was ampliied with primers NS1 and NS24 and sequenced
using primers NS1–NS4, NS6, NS24 (White et al. 1990; Gargas et
al. 1992). The components for the PCR were used as described
by Schroers (2000). The PCR program was 60 s at 94 °C (initial
denaturation); 35 cycles of 35 s at 94 °C (denaturation), 50 s at
55 °C (annealing), and 120 s at 72 °C (elongation); and 6 min at
72 °C (inal elongation) followed by chilling to 4 °C. The PCR
products were puriied with a GFX puriication kit (Amersham
Pharmacia Biotech Inc., Roosendaal, The Netherlands) and
visualised on an electrophoresis gel after ethidium bromide
staining. The rDNA was sequenced with a BigDye terminator
cycle sequencing kit (Applied Biosystems, Foster City, Calif.) and
analysed on an ABI Prism 3700 instrument (Applied Biosystems)
by using the standard conditions recommended by the vendor.
The primers used in the sequence reaction were NL1 and NL4
(O’Donnell 1993), and LR5.
Alignments and phylogenetic analyses
Sequences were assembled and edited using SeqMan II software
(DNAStar, Inc., Madison, Wis.). Manual alignments were performed
using MacClade v. 4.08 (Maddison & Maddison 2003). Ambiguous
regions (sensu Lutzoni et al. 2000) and introns were delimited
manually and excluded from the alignments. Congruence was
tested using a 70 % reciprocal bootstrap criterion (Mason-Gamer
& Kellogg 1996, Reeb et al. 2004). Final phylogenetic analyses
of the two-gene and one-gene datasets were performed using
Stamatakis’s “randomised axelerated (sic) maximum likelihood
for high performance computing” (RAxML VI-HPC, Stamatakis et
al. 2005, 2008) on the Cipres Web Portal (http://www.phylo.org/
sub_sections/portal/). For the two-gene analysis, the maximum
likelihood search followed a "GTRMIX" model of molecular
evolution applied to two partitions, nucLSU and nucSSU. The
same model was applied to the one-gene analysis without partition.
Support values were obtained in RAxML with bootstrap analyses
of 500 pseudoreplicates. The trees are labeled with the updated
scientiic names.
MATeRIAls AND MeThODs
Two separate sets of data matrices were assembled (Table 1).
The irst is a two-gene analysis that aims at investigating the
phylogenetic position of Acremonium within the Sordariomycetes.
The second is a one-gene analysis focusing on the Acremonium
strains belonging to the order Hypocreales. The irst set includes
the large and small subunits of the nuclear ribosomal RNA gene
(nucLSU and nucSSU, respectively) and 166 taxa, including 56
strains of Acremonium, 105 reference taxa of Sordariomycetes,
and ive species of Leotiomycetes as an outgroup (Botryotinia
fuckeliana, Chalara aurea, Leotia lubrica, Microglossum rufum, and
Pseudeurotium zonatum). The second set includes only the nucLSU
for 331 taxa including 170 strains of Acremonium, 158 sequences
of Hypocreales, and three outgroup species (Ceratocystis imbriata,
Glomerella cingulata, and Ophiostoma piluliferum).
DNA isolation and sequencing
DNA was extracted with a FastDNA kit (Qbiogene, Heidelberg,
Germany) from mycelium grown for 5–14 d in liquid Complete
140
ResUlTs
DNA sequence alignments
A total of 228 new sequences were generated for Acremonium, 192
nucLSU and 36 nucSSU (Table 1). For the two-gene dataset, one
nucLSU and 41 nucSSU sequences were missing. After exclusion
of ambiguous regions and introns, the two-gene dataset included 2
955 characters (1 250 nucLSU and 1 705 nucSSU). Among these,
1 739 were constant while 900 were parsimony-informative. After
exclusion of ambiguous regions and introns, the one-gene dataset
included 848 characters. Among these, 481 were constant while
260 were parsimony-informative.
Phylogenetic inference
As shown in Fig. 1, the species of Acremonium mostly fall into
three groups, namely the Hypocreales, the Plectosphaerellaceae,
and the Sordariales. The bulk of species fall into the Hypocreales.
Gliomastix/Bionectria clade
99
“Acremonium hyalinulum” CBS 271.36
Roumegueriella rufula
75
Hydropisphaera erubescens 1
Acremonium
spinosum CBS 136.33 T
99 85
Acremonium rutilum CBS 396.66 T
Bionectria ochroleuca 2
99 “Acremonium blochii” CBS 427.93
Acremonium pinkertoniae CBS 157.70 T
97
Acremonium chrysogenum CBS 144.62 T chrysogenum
74
-clade
Acremonium flavum CBS 596.70 T
Acremonium sclerotigenum CBS 124.42 T
Geosmithia lavendula
99 Geosmithia putterillii
“Acremonium egyptiacum” CBS 303.64
sclerotigenum/Geosmithia clade
Sarocladium bactrocephalum CBS 749.69 T
Sarocladium strictum CBS 346.70 T
strictum
Sarocladium
kiliense CBS 146.62
95
-clade
Sarocladium kiliense CBS 122.29 T
99
Sarocladium zeae CBS 801.69 T
Acremonium breve CBS 150.62 T
Acremonium radiatum CBS 142.62 T breve/curvulum
-clade
Acremonium gamsii CBS 726.71 T
96
Acremonium curvulum CBS 430.66 T
“Acremonium blochii” CBS 424.93
persicinum
98
Acremonium persicinum CBS 310.59 T -clade
96 99
Glomerellales
Hypocreales
Sarocladium clade
Acremoniella lutzi T
Petriella setifera
Doratomyces stemonitis
Microascales (1)
Microascus longirostris
93
Microascus trigonosporus
Aniptodera chesapeakensis
99
Halosphaeria appendiculata
Lignincola laevis
99
Nimbospora effusa
96
Halosphaeriales
Nohea umiumi
80
Corollospora maritima
95
Varicosporina ramulosa
Ceriosporopsis halima
Graphium penicillioides Microascales (2)
Ambrosiella xylebori
Microascales (3)
Ceratocystis fimbriata
Acremonium alcalophilum CBS 114.92 T
Acremonium restrictum CBS 178.40 T
Acremonium antarcticum CBS 987.87
92
89
Acremonium stromaticum CBS 863.73 T
Acremonium furcatum CBS 122.42 T
75
Verticillium alboatrum (Acremonium apii T) CBS 130.51
Verticillium dahliae
Acremonium nepalense CBS 971.72 T
Plectosphaerella cucumerina
70
Acremonium cucurbitacearum CBS 683.88
96
Acremonium brunnescens CBS 559.73 T
Glomerella cingulata
“Acremonium alternatum” CBS 406.66
92 Sarocladium bacillisporum CBS 425.67 T bacillisporum
-clade
“Acremonium implicatum” CBS 243.59
Plectosphaerellaceae
acremonium phylogeny
A
Fig. 1.A–C. The phylogenetic position of Acremonium and related fungi within the Sordariomycetes, as seen in combined analysis of the large and small subunits of the nuclear
ribosomal RNA gene (LSU + SSU) analysed by maximum likelihood via RAxML VI-HPC following a GTRMIX model applied to two partitions. 100 % bootstrap values are
indicated by a black dot on the relevant internode.
www.studiesinmycology.org
141
71
96
Simplicillium lanosoniveum CBS 321.72
Cordycipitaceae
Cordyceps cardinalis
Acremonium camptosporum CBS 756.69 T
Paecilomyces lilacinus 2
Elaphocordyceps capitata
Ophiocordycipitaceae
Elaphocordyceps ophioglossoides
Balansia henningsiana
Epichloe typhina
Clavicipitaceae
Claviceps purpurea
Acremonium guillematii CBS 766.69 T
Acremonium minutisporum CBS 147.62 T
Acremonium vitellinum CBS 792.69 T
Acremonium exiguum CBS 587.73 T
“Acremonium potronii” CBS 416.68
Acremonium psammosporum CBS 590.63 T
Acremonium recifei CBS 137.35 T
Nectria cinnabarina
Acremonium roseolum CBS 289.62 T
Stachybotrys chartarum
Stachybotrys/
Stachybotrys subsimplex
Peethambara
-clade
Myrothecium roridum 1
Peethambara spirostriata
Pseudonectria rousseliana
Acremonium nigrosclerotium CBS 154.72 T
96 Hypocrea americana
Hypocrea lutea
Hypocreaceae
Sphaerostilbella berkeleyana
Niesslia exilis
Nectria haematococca
Chaetosphaerella phaeostroma
96
Melanospora tiffanii
Melanospora zamiae
Lindra thalassiae
Lulworthiales
Lulworthia grandispora
“Acremonium alabamense” CBS 456.75
Cercophora terricola
Apiosordaria verruculosa
97 Cercophora striata
Podospora decipiens
Bombardia bombarda
Lasiosphaeria ovina
71
Sordariales
Cercophora newfieldiana
Gelasinospora tetrasperma
99
Neurospora crassa
Immersiella immersa
Lasiosphaeria hispida
Podospora fibrinocaudata
Strattonia carbonaria
Camarops amorpha
84
Camarops
microspora
98
Boliniales
Camarops tubulina
94 Camarops ustulinoides
97 Chaetosphaeria ovoidea
89
Chaetosphaeriales
Menispora tortuosa
Melanochaeta hemipsila
74
Lasiosphaeriella nitida
Linocarpon appendiculatum
Fig. 1. (Continued).
142
Hypocreales
SuMMerbell et al.
B
acremonium phylogeny
99
Cephalothecaceae
“Acremonium cf. alternatum” CBS 109043
Acremonium atrogriseum CBS 544.79
75
Acremonium atrogriseum CBS 981.70
80 Acremonium atrogriseum CBS 774.97
Acremonium atrogriseum CBS 507.82
Acremonium atrogriseum CBS 733.70
86
Acremonium atrogriseum CBS 252.68
Acremonium atrogriseum CBS 604.67 T
92 Acremonium atrogriseum CBS 306.85
Cephalotheca sulfurea
Acremonium thermophilum CBS 734.71 T
88
Albertiniella polyporicola
Coniochaeta ostrea
99
Coniochaetales
98 Coniochaeta savoryi
70 Coniochaeta discoidea
Annulatascus triseptatus
89
Fragosphaeria purpurea
91
Ophiostoma piliferum 1 Ophiostomatales
97
Ophiostoma stenoceras
Papulosa amerospora
Apiognomonia errabunda
92 Plagiostoma euphorbiae
Cryptodiaporthe aesculi
99 Gnomonia gnomon
Cryptosporella hypodermia
95 Melanconis alni
Melanconis stilbostoma
89 99
81
Melanconis marginalis
Chromendothia citrina
Diaporthales
97
Endothia gyrosa
89 Chrysoporthe cubensis
Diaporthe eres
Diaporthe phaseolorum
84
Mazzantia napelli
88 Leucostoma niveum
Valsella salicis
Valsa ambiens
Cryphonectria parasitica
Anthostomella torosa
Apiospora montagnei
Diatrype disciformis
82
Eutypa lata
Xylariales
Graphostroma platystoma
77
Xylaria acuta
Xylaria hypoxylon
90
Seynesia erumpens
Leotia lubrica
Microglossum rufum
Pseudeurotium zonatum
Chalara aurea
Leotiomycetes (outgroup)
Acremonium butyri (?) CBS 301.38 T
Acremonium lichenicola CBS 425.66 T
Botryotinia fuckeliana
0.01 substitutions/site
C
Fig. 1. (Continued).
www.studiesinmycology.org
143
SuMMerbell et al.
Table 1. List of Acremonium species included in this study as well as other novel or independently redone sequences of related fungi
used for comparison. Sequences from GenBank of other comparison taxa are listed in Supplemental Table 1a - see online Supplementary
Information. Collection and GenBank numbers are indicated and type strains (T) are mentioned. Sequences generated in this study are
shown in bold. Dashes indicate missing data in the two-gene analysis. Isolates that cannot be assigned a phylogenetically conirmed name
are listed under the name under which they are currently held in the CBS collection.
Currently assigned species name Collection numbers nuclsU
Acremoniella lutzi T
Acremonium acutatum T
Acremonium alabamense
Acremonium alcalophilum T
Acremonium alternatum T
“Acremonium alternatum”
“Acremonium cf. alternatum”
Acremonium antarcticum
Acremonium atrogriseum T
Acremonium biseptum T
“Acremonium blochii”
Acremonium borodinense T
Acremonium brachypeniumT
Acremonium breve T
Acremonium brunnescens T
Acremonium butyri T
Acremonium camptosporum T
Acremonium cavaraeanum
Acremonium cerealis
Acremonium chrysogenum T
Acremonium cucurbitacearum
Acremonium curvulum T
“Acremonium aff. curvulum”
Acremonium egyptiacum
Acremonium exiguum T
Acremonium exuviarum T
Acremonium lavum T
Acremonium fuci
Acremonium furcatum T
144
CBS 103.48
CBS 682.71
CBS 456.75
CBS 114.92
CBS 407.66
CBS 381.70A
CBS 406.66
CBS 831.97
CBS 114602
CBS 109043
CBS 987.87
CBS 604.67
CBS 252.68
CBS 306.85
CBS 507.82
CBS 544.79
CBS 733.70
CBS 774.97
CBS 981.70
CBS 750.69
CBS 324.33
CBS 424.93
CBS 427.93
CBS 993.69
CBS 101148
CBS 866.73
CBS 150.62
CBS 559.73
CBS 301.38
CBS 756.69
CBS 677.74
CBS 757.69
CBS 835.91
CBS 890.85
CBS 758.69
CBS 207.65
CBS 215.69
CBS 144.62
CBS 683.88
CBS 430.66
CBS 104.78
CBS 214.70
CBS 229.75
CBS 333.92
CBS 384.70A
CBS 384.70C
CBS 523.72
CBS 761.69
CBS 898.85
CBS 110514
CBS 100551
CBS 113275
CBS 303.64
CBS 587.73
UAMH 9995
CBS 596.70
UAMH 6508
CBS 122.42
hQ231971
hQ231965
hQ231972
hQ231973
hQ231988
hQ231986
hQ231987
hQ231989
hQ231990
hQ231974
hQ231975
hQ231981
hQ231977
hQ231978
hQ231979
hQ231980
hQ231982
hQ231983
hQ231984
hQ231998
hQ231999
hQ232000
hQ232001
hQ232002
hQ232003
hQ232004
hQ232005
hQ231966
hQ231967
hQ232008
hQ232007
hQ232009
hQ232010
hQ232011
hQ232012
hQ232013
hQ232014
hQ232017
hQ231968
hQ232026
hQ232019
hQ232020
hQ232021
hQ232022
hQ232023
hQ232024
hQ232028
hQ232029
hQ232030
hQ232032
hQ232031
hQ232033
hQ232034
hQ232035
hQ232036
hQ232037
hQ232038
AY378154
nucssU
Notes
–
Ex-type of Acremoniella lutzi
–
–
Ex-type of Acremonium alcalophilum
hQ232178
–
–
–
–
–
–
–
–
–
–
Ex-type of Phaeoscopulariopsis atrogrisea
Ex-type of Acremonium biseptum
hQ232181
hQ232182
Ex-type of Acremonium borodinense
hQ232183
hQ232184
–
hQ232186
Ex-type of Cephalosporium roseum var. breve
Ex-type of Acremonium brunnescens
Ex-type of Tilachlidium butyri; synonym of Cadophora malorum
Ex-type of Acremonium camptosporum
Ex-type of Gliomastix guttuliformis
hQ232187
–
hQ232188
Ex-type of Cephalosporium chrysogenum
Previously identiied as Acremonium strictum
Ex-type of Acremonium curvulum
hQ232189
hQ232190
Ex-type of Acremonium exiguum
hQ232191
Ex-type of Acremonium lavum
hQ232192
Ex-type of Acremonium furcatum
acremonium phylogeny
Table 1. (Continued).
Currently assigned species name Collection numbers nuclsU
Acremonium fusidioides T
Acremonium gamsii T
Acremonium guillematii T
Acremonium hansfordii
Acremonium hennebertii T
Acremonium hyalinulum
“Acremonium implicatum”
Acremonium incrustatumT
Acremonium inlatum T
Acremonium lichenicola T
Acremonium longisporum
“Acremonium luzulae”
Acremonium minutisporum T
Acremonium nepalense T
Acremonium nigrosclerotium T
Acremonium persicinum T
“Acremonium persicinum”
“Acremonium aff. persicinum”
“Acremonium cf. persicinum”
Acremonium pinkertoniae T
“Acremonium potronii”
Acremonium psammosporum T
Acremonium pseudozeylanicum T
Acremonium pteridii T
Acremonium radiatum T
Acremonium recifei T
“Acremonium recifei”
www.studiesinmycology.org
CBS 840.68
CBS 726.71
CBS 766.69
CBS 390.73
CBS 768.69
CBS 271.36
CBS 243.59
CBS 397.70B
CBS 159.70
CBS 212.69
CBS 439.70
CBS 403.70
CBS 425.66
CBS 113.69
CBS 495.67
CBS 579.73
CBS 147.62
det 267B
CBS 971.72
CBS 154.72
CBS 310.59
CBS 169.65
CBS 295.70A
CBS 295.70M
CBS 330.80
CBS 378.70A
CBS 378.70D
CBS 378.70 E
CBS 439.66
CBS 469.67
CBS 101694
CBS 102349
CBS 378.70C
CBS 110646
CBS 203.73
CBS 263.89
CBS 102877
CBS 157.70
CBS 189.70
CBS 379.70F
CBS 416.68
CBS 433.88
CBS 781.69
CBS 590.63
CBS 560.73
CBS 782.69
CBS 784.69
CBS 142.62
CBS 137.35
CBS 135.71
CBS 220.84
CBS 362.76
CBS 402.89
CBS 411.91
CBS 442.66
CBS 541.89
CBS 555.73
CBS 596.74
CBS 976.70
CBS 400.85
CBS 505.94
CBS 485.77
CBS 482.78
hQ232039
hQ232040
hQ232042
hQ232043
hQ232044
hQ232045
hQ232046
hQ232047
hQ232049
hQ232050
hQ232051
hQ231991
hQ231969
hQ232057
hQ232058
hQ232059
hQ232061
hQ232062
hQ231970
hQ232069
hQ232077
hQ232072
hQ232075
hQ232076
hQ232078
hQ232079
hQ232081
hQ232082
hQ232083
hQ232084
hQ232085
hQ232086
hQ232080
hQ232088
hQ232073
hQ232074
hQ232087
hQ232089
hQ232094
hQ232096
hQ232097
hQ232098
hQ232099
hQ232100
hQ232101
hQ232102
hQ232103
hQ232104
hQ232106
hQ232105
hQ232107
hQ232108
hQ232109
hQ232110
hQ232111
hQ232114
hQ232115
hQ232116
hQ232117
hQ232025
hQ232027
hQ232113
hQ232112
nucssU
hQ232193
hQ232194
hQ232195
hQ232196
Notes
Ex-type of Paecilomyces fusidioides
Ex-type of Acremonium gamsii
Ex-type of Acremonium guillematii
Ex-type of Acremonium hennebertii
Authentic strain of Fusarium terricola
Ex-type of Gliomastix inlata
–
In CBS as Acremonium atrogriseum
Ex-type of Acremonium lichenicola
hQ232199
Ex-type of Cephalosporium minutisporum
–
hQ232200
hQ232201
Ex-type of Acremonium nepalense
Ex-type of Acremonium nigrosclerotium
Ex-type of Paecilomyces persicinus
hQ232202
Ex-type of Acremonium pinkertoniae
hQ232203
hQ232204
Ex-type of Acremonium psammosporum
Ex-type of Acremonium pseudozeylanicum
Ex-type of Acremonium pteridii
hQ232205
hQ232206
Ex-type of Cephalosporium acremonium var. radiatum
Ex-type of Cephalosporium recifei
In CBS as Acremonium curvulum
In CBS as Acremonium cf. curvulum
145
SuMMerbell et al.
Table 1. (Continued).
Currently assigned species name Collection numbers nuclsU
CBS 110348
Acremonium restrictum T
CBS 178.40
Acremonium rhabdosporum T
CBS 438.66
Acremonium roseolum T
CBS 289.62
Acremonium rutilum T
CBS 396.66
Acremonium salmoneum T
CBS 721.71
Acremonium sclerotigenum T
CBS 124.42
CBS 270.86
CBS 281.80
CBS 384.65
CBS 786.69
CBS 100816
OMH F1648.97
OMH F2365.97
OMH F2969.97
OMH F3691.97
CBS 287.70O
CBS 379.70D
CBS 223.70
Acremonium sordidulum T
CBS 385.73
Acremonium sp.
CBS 314.72
Acremonium spinosum T
CBS 136.33
“Acremonium strictum”
CBS 106.23
CBS 147.49
Acremonium stromaticum T
CBS 863.73
Acremonium tectonae T
CBS 725.87
Acremonium thermophilum T
CBS 734.71
Acremonium tsugae T
CBS 788.69
Acremonium tubakii T
CBS 790.69
“Acremonium tubakii”
CBS 824.69
Acremonium verruculosum T
CBS 989.69
Acremonium vitellinum T
CBS 792.69
Acremonium zeylanicum
CBS 746.73
Acremonium zonatum
CBS 565.67
“Cephalosporium acremonium var. cereum” T CBS 140.62
“Cephalosporium
acremonium
funiculosum” T
“Cephalosporium ballagii” T
hQ232118
hQ232119
hQ232120
hQ232123
hQ232124
hQ232125
hQ232126
hQ232127
hQ232128
hQ232129
hQ232130
hQ232131
hQ232132
hQ232133
hQ232134
hQ232135
hQ232140
hQ232095
hQ231985
hQ232136
hQ232156
hQ232137
hQ232138
hQ232139
hQ232143
hQ232144
hQ232145
hQ232146
hQ232148
hQ232149
hQ232150
hQ232151
hQ232154
hQ232155
hQ232147
var. CBS 141.62
hQ232053
CBS 134.33
hQ232016
“Cephalosporium malorum” T
CBS 117.25
hQ232015
“Cephalosporium purpurascens” T
CBS 149.62
hQ232071
Cosmospora khandalensis T
CBS 356.65
hQ231996
Cosmospora lavitskiaeT
CBS 530.68
hQ231997
Gliomastix masseei
Gliomastix murorum
CBS 794.69
CBS 154.25
hQ232060
hQ232063
CBS 195.70
CBS 119.67
CBS 157.72
CBS 378.36
hQ232064
hQ232066
hQ232067
hQ232068
CBS 181.27
hQ232091
CBS 151.26
hQ232090
Gliomastix roseogrisea T
CBS 617.94
CBS 134.56
hQ232093
hQ232121
Lanatonectria lavolanata
CBS 279.79
CBS 213.69
CCFC 226570
CBS 211.69
CBS 230.31
hQ232122
hQ232092
AY283559
hQ232065
hQ232157
Gliomastix polychroma T
146
nucssU
Notes
–
Ex-type of Verticillium dahliae f. restrictum
Ex-type of Acremonium rhabdosporum
Ex-type of Paecilomyces roseolus
Ex-type of Acremonium rutilum
Ex-type of Acremonium salmoneum
Ex-type of Cephalosporium sclerotigenum
hQ232207
hQ232208
hQ232209
In CBS as Acremonium strictum
In CBS as Acremonium potronii
In CBS as Acremonium alternatum
Ex-type of Acremonium sordidulum
hQ232210
Ex-type of Cephalosporium spinosum
–
Ex-type of Acremonium stromaticum
Ex-type of Acremonium tectonae
Ex-type of Acremonium thermophilum
Ex-type of Acremonium tsugae
Ex-type of Acremonium tubakii
–
hQ232212
Ex-type of Acremonium verruculosum
Ex-type of Acremonium vitellinum
Ex-type of Cephalosporium acremonium var. cereum. In CBS as
Acremonium tubakii
Ex-type of Cephalosporium acremonium var. funiculosum. In CBS
as Acremonium kiliense
Ex-type of Cephalosporium ballagii. In CBS as Acremonium
charticola
Ex-type of Cephalosporium malorum. In CBS as Acremonium charticola
Ex-type of Cephalosporium purpurascens. In CBS as Acremonium
persicinum
Ex-type of Cephalosporium khandalense. In CBS as Acremonium
berkeleyanum
Ex-type of Gliomastix lavitskiae. In CBS as Acremonium berkeleyanum
In CBS as Acremonium masseei
Ex-type of Graphium malorum. In CBS as Acremonium murorum
var. felina
In CBS as Acremonium murorum var. felina
In CBS as Acremonium murorum var. murorum
In CBS as Acremonium murorum var. murorum
Ex-type of Torula cephalosporioides. In CBS as Acremonium
murorum var. murorum
Ex-type of Oospora polychroma. In CBS as Acremonium polychromum
Ex-type of Periconia tenuissima var. nigra. In CBS as Acremonium
polychromum
In CBS as Acremonium polychromum
Ex-type of Cephalosporium roseogriseum. In CBS as Acremonium
roseogriseum
In CBS as Acremonium roseogriseum
In CBS as Acremonium polychromum
Identiied as Acremonium murorum var. felina
In CBS as Acremonium murorum var. felina
acremonium phylogeny
Table 1. (Continued).
Currently assigned species name Collection numbers nuclsU
Lanatonectria locculenta
Leucosphaerina arxii T
Nalanthamala diospyri T
Nectria rishbethii T
Neocosmospora endophytica
Paecilomyces lilacinus
Pochonia bulbillosa
Sarcopodium circinatum
Sarcopodium circinosetiferum
Sarcopodium vanillae
Sarocladium attenuatum T
Sarocladium bacillisporum T
Sarocladium bactrocephalum T
Sarocladium glaucum T
Sarocladium kiliense T
CBS 113461
CBS 737.84
CBS 560.89
CBS 496.67
AR 2674
CBS 101068
CBS 102853
CBS 376.81
CBS 587.92
CBS 114068
CBS 100251
CBS 100252
CBS 100998
CBS 101116
CBS 100582
CBS 399.73
CBS 425.67
CBS 749.69
NRRL 20583
CBS 796.69
CBS 122.29
CBS 146.62
hQ232158
hQ232159
hQ232160
hQ232162
U17411
hQ232163
hQ232164
hQ232167
hQ232168
hQ232169
hQ232170
hQ232171
hQ232172
hQ232173
hQ232174
hQ232165
hQ231992
hQ231994
hQ231995
hQ232041
hQ232052
hQ232048
CBS 155.61
hQ232054
CBS 156.61
hQ232055
CBS 157.61
Sarocladium ochraceum T
Sarocladium oryzae
Sarocladium strictum T
“Sarocladium cf. strictum”
Sarocladium zeae T
CBS 428.67
CBS 180.74
CBS 346.70
JY03-006
CBS 801.69
KAS 965
Simplicillium lanosoniveum
CBS 321.72
Simplicillium obclavatum T
CBS 311.74
Trichothecium crotocinigenum T
CBS 129.64
“Trichothecium indicum”/ Leucosphaerina CBS 123.78
indicaT
Trichothecium roseum
DAOM 208997
Trichothecium sympodiale
ATCC 36477
Verticillium alboatrum
CBS 130.51
Verticillium insectorum
CBS 101239
Verticillium leptobactrum
CBS 109351
hQ232214
hQ232179
hQ232180
hQ232198
hQ232197
hQ232056
hQ232070
hQ232166
hQ232141
hQ232142
hQ232152
hQ232153
hQ232006
hQ232175
hQ232018
AF096194
U69891
U69889
hQ231976
hQ248107
hQ231993
Nine of the named Acremonium species in this analysis belong to
the Plectosphaerellaceae. The Sordariales are represented in Fig.
1 only by Acremonium alabamense, the only named Acremonium
species in Acremonium section Chaetomioidea. Outside these
groups Acremonium atrogriseum, represented by numerous
conspeciic isolates, belongs to the family Cephalothecaceae (Fig.
1C), along with Albertiniella polyporicola and Cephalotheca sulfurea;
this family is sister to the Coniochaetales. Another Acremonium
species, A. thermophilum, falls into the Cephalothecaceae clade
grouping with Albertiniella polyporicola. An isolate provisionally
identiied as Acremonium alternatum, CBS 109043 is a member
of the Cephalothecaceae. The complex status of A. alternatum is
discussed below.
The Acremonium species in the Hypocreales form an array of
poorly to well distinguished clades, most of which do not correspond
to previously recognised genera or suprageneric taxa. Included within
the Hypocreales in the Sarocladium clade labeled the "strictum-clade"
www.studiesinmycology.org
nucssU
Notes
Ex-type of Leucosphaerina arxii
Ex-type of Cephalosporium diospyri = Acremonium diospyri
Ex-type of Nectria rishbethii
Anamorph is Acremonium fungicola
Atypical monophialidic isolate, Acremonium+E402-like
Atypical isolate
Ex-type of Sarocladium attenuatum
Ex-type of Acremonium bacillisporum
Ex-type of Acremonium bactrocephalum
Ex-type of Acremonium glaucum
Ex-type of Acremonium kiliense
Ex-type of Cephalosporium incoloratum. In CBS as Acremonium
incoloratum
Ex-type of Cephalosporium incarnatum. In CBS as Acremonium
kiliense
Ex-type of Cephalosporium incarnatum var. macrospora. In CBS as
Acremonium kiliense
Ex-type of Cephalosporium infestans.In CBS as Acremonium kiliense
Ex-type of Paecilomyces ochraceus. In CBS as Acremonium ochraceum
hQ232211
Ex-type of Acremonium strictum
hQ232213
Ex-type of Acremonium zeae
hQ232185
Ex-type of Acremonium byssoides
Ex-type of Acremonium obclavatum
Ex-type of Acremonium crotocinigenum
Ex-type of ‘Leucosphaera’ indica
–
In CBS as Spicellum roseum
Ex-type of Cephalosporium apii, in CBS as Acremonium apii
In CBS as Acremonium cf. bacillisporum
is the well known soil fungus long known as Acremonium strictum (Fig.
1A). The soil fungus and human opportunistic pathogen traditionally
called A. kiliense is also included as is the maize corn endophyte
known as A. zeae. The corresponding clade in Fig. 2C based on
LSU reveals that this group of fungi includes the rice pathogen
Sarocladium oryzae as a saltatory morphological apomorph. No
teleomorphs are known to be associated with this group. This
clade consists of fungi forming conidia in mucoid heads; it is closely
related to a clade of species forming catenulate conidia, namely
the Acremonium bacillisporum clade including A. bacillisporum, A.
glaucum, A. implicatum pro parte, and, in a separate subclade, A.
ochraceum (Figs 1A, 2C). The "bacillisporum-clade" and "strictumclade" grouped together in an overall Sarocladium clade (Figs 1,
2). Two catenulate-conidial isolates labeled A. alternatum are also
loosely associated with the A. bacillisporum clade in Fig. 2C. In Fig.
1A, one isolate CBS 406.66 is connected to the Sarocladium and A.
breve/curvulum clades with a 96 % bootstrap value.
147
SuMMerbell et al.
85
94
T
“Cephalosporium acremonium var. cereum” CBS 140.62 T
Acremonium sclerotigenum CBS 223.70
Acremonium sclerotigenum CBS 379.70D
Acremonium sclerotigenum OMH F2365.97
Acremonium sclerotigenum OMH F2969.97
Acremonium sclerotigenum OMH F1648.97
Acremonium sclerotigenum OMH F3691.97
Mycopepon smithii
Pseudonectria sp.
Acremonium sclerotigenum CBS 100816
sclerotigenum
Acremonium sclerotigenum CBS 287.70O
-clade
Acremonium sclerotigenum CBS 384.65
Acremonium sclerotigenum CBS 281.80
Acremonium sclerotigenum CBS 270.86
89 Acremonium sclerotigenum CBS 124.42 T
Acremonium sclerotigenum CBS 786.69
Acremonium alternatum CBS 407.66 T
“Cephalosporium malorum” CBS 117.25 T
Acremonium sordidulum CBS 385.73 T
Acremonium brachypenium CBS 866.73 T
brachypenium
83 “Cephalosporium purpurascens” CBS 149.62 T
-clade
“Acremonium potronii” CBS 189.70
Acremonium exuviarum UAMH 9995 T
“Acremonium tubakii” CBS 824.69
Emericellopsis
terricola
79
Acremonium fuci UAMH 6508
Emericellopsis
“Acremonium potronii” CBS 379.70F
Acremonium salmoneum CBS 721.71 T -clade
99
93 Stilbella fimetaria
Acremonium tubakii CBS 790.69 T
Stanjemonium grisellum
Acremonium chrysogenum CBS 144.62 T
90 Acremonium flavum CBS 596.70 T
chrysogenum
71 Hapsidospora irregularis
-clade
Nigrosabulum globosum
74 Mycoarachis inversa
Geosmithia lavendula
Geosmithia putterillii
“Acremonium blochii” CBS 993.69
99 Acremonium borodinense CBS 101148 T pinkertoniae
96
Acremonium pinkertoniae CBS 157.70 T
-clade
Bulbithecium hyalosporum
Leucosphaerina arxii T
“Acremonium cf. persicinum” CBS 102877
“Acremonium
alternatum” CBS 381.70A
85
“Acremonium alternatum” CBS 831.97
“Acremonium cavaraeanum” CBS 758.69 fusidioides
Acremonium hennebertii CBS 768.69 T
-clade
Acremonium fusidioides CBS 840.68 T
“Acremonium hansfordii” CBS 390.73
“Acremonium egyptiacum” CBS 303.64
99 “Acremonium blochii” CBS 427.93
96
“Acremonium blochii” CBS 324.33
Verticillium insectorum
“Acremonium zeylanicum” CBS 746.73
Stilbocrea macrostoma
sclerotigenum/Geosmithia-clade
75 Acremonium acutatum CBS 682.71
A
Fig. 2.A–E. The phylogenetic position of Acremonium and related fungi within the Hypocreales, as seen in nucLSU analysed by maximum likelihood via RAxML VI-HPC
following a GTRMIX model applied to a single partition. 100 % bootstrap values are indicated by a black dot on the relevant internode.
148
acremonium phylogeny
Acremonium biseptum CBS 750.69 T cerealis
Acremonium cerealis CBS 207.65
-clade
Acremonium cerealis CBS 215.69
93 “Acremonium blochii” CBS 424.93
Acremonium persicinum CBS 378.70E
Acremonium persicinum CBS 378.70D
Acremonium persicinum CBS 378.70A
Acremonium persicinum CBS 102349
Acremonium persicinum CBS 169.65
persicinum
Acremonium persicinum CBS 295.70M
Acremonium persicinum CBS 295.70A
-clade
Acremonium persicinum CBS 439.66
Acremonium persicinum CBS 101694
Acremonium
persicinum CBS 469.67
91
Acremonium persicinum CBS 330.80
Acremonium verruculosum CBS 989.69 T
Acremonium persicinum CBS 310.59 T
Hydropisphaera erubescens 2
Hydropisphaera erubescens 1
Gliomastix masseei CBS 794.69 T
Gliomastix murorum CBS 157.72
Gliomastix murorum CBS 195.70
Gliomastix murorum CBS 119.67
80
Gliomastix murorum CBS 378.36
92
Gliomastix murorum CBS 154.25
98 Gliomastix polychroma CBS 151.26
Gliomastix polychroma CBS 181.27 T
Gliomastix polychroma CBS 617.94
Gliomastix roseogrisea CBS 211.69
Gliomastix roseogrisea CBS 213.69
Gliomastix roseogrisea CBS 134.56 T
99 Gliomastix roseogrisea CBS 279.79
Gliomastix roseogrisea CCFC 226570
Heleococcum japonicum
99
Hydropisphaera peziza 1
89 Hydropisphaera peziza 2
Roumegueriella rufula
72
Selinia pulchra
“Acremonium hyalinulum” CBS 271.36
Nalanthamala squamicola
“Acremonium aff. persicinum” CBS 203.73
“Acremonium luzulae” CBS 495.67
Nectria zonata
Acremonium tectonae CBS 725.87 T
“Acremonium longisporum” CBS 113.69
“Acremonium persicinum” CBS 378.70C
100 “Acremonium aff. persicinum” CBS 263.89
Acremonium rutilum CBS 396.66 T
Acremonium pteridii CBS 784.69
pteridii
100 Acremonium spinosum CBS 136.33 T
-clade
Acremonium pteridii CBS 782.69 T
Ochronectria calami
93 Bionectria grammicospora
Bionectria ochroleuca 2
72
Nectria sesquicillii
Bionectria pityrodes
Stephanonectria keithii
Nectriopsis sporangiicola
99
93 Nectriopsis violacea
Sesquicillium microsporum
Kallichroma glabrum
Tilachlidium brachiatum
86
78
Fig. 2. (Continued).
www.studiesinmycology.org
Gliomastix/Bionectria-clade
Gliomastix clade
85
B
149
SuMMerbell et al.
Acremonium incrustatum CBS 159.70 T
“Acremonium potronii” CBS 433.88
93
Linkosia fusiformis
Acremonium guillematii CBS 766.69 T
“Acremonium persicinum” CBS 110646
Acremonium sp. CBS 314.72
minutisporum
Acremonium vitellinum CBS 792.69 T
T
Acremonium
minutisporum
CBS
147.62
100
-clade
Acremonium minutisporum det 267B
100 “Acremonium alternatum” CBS 406.66
“Acremonium alternatum” CBS 114602
99 Sarocladium bacillisporum CBS 425.67 T bacillisporum
77 “Acremonium implicatum” CBS 243.59
-clade
Sarocladium glaucum CBS 796.69 T
94 Sarocladium bactrocephalum CBS 749.69 T
Sarocladium bactrocephalum NRRL 20583
84 Sarocladium cf. strictum JY03-006
83 Sarocladium strictum CBS 346.70 T
“Acremonium zonatum” CBS 565.67
84
Sarocladium
100 Sarocladium attenuatum T
strictum
Sarocladium oryzae
-clade
94 Sarocladium kiliense CBS 146.62
-clade
Sarocladium kiliense CBS 122.29 T
Sarocladium kiliense CBS 155.61
Sarocladium kiliense CBS 157.61
Sarocladium kiliense CBS 156.61
Sarocladium zeae CBS 801.69 T
98 Sarocladium zeae KAS 965
Sarocladium ochraceum CBS 428.67 T
Acremonium breve CBS 150.62 T
76 Acremonium radiatum CBS 142.62 T
breve
91 “Acremonium strictum” CBS 147.49
100
“Cephalosporium acremonium var. funiculosum” CBS 141.62 T -clade
Acremonium gamsii CBS 726.71 T
83 Trichothecium crotocinigenum CBS 129.64 T
“Trichothecium indicum”/Leucosphaerina indica T Trichothecium
100
Trichothecium sympodiale
-clade
73 Trichothecium roseum
74 Acremonium curvulum CBS 430.66 T
75 Acremonium curvulum CBS 229.75
Acremonium curvulum CBS 384.70A
Acremonium curvulum CBS 898.85
100 Acremonium curvulum CBS 761.69
curvulum
Acremonium curvulum CBS 333.92
-clade
Acremonium curvulum CBS 214.70
Acremonium
curvulum
CBS
110514
95
Acremonium curvulum CBS 384.70C
100
Acremonium curvulum CBS 104.78
Acremonium curvulum CBS 523.72
Valetoniellopsis laxa
Acremonium rhabdosporum CBS 438.66 T
Lanatonectria flavolanata 1
98
Lanatonectria flavolanata 2
Sarcopodium vanillae
94 Sarcopodium circinatum 2
Sarcopodium circinosetiferum 3 Lanatonectria
Sarcopodium circinosetiferum 4 -clade
82 Lanatonectria flocculenta
Sarcopodium circinosetiferum 2
84
Sarcopodium circinosetiferum 1
Pseudonectria rousseliana
Fig. 2. (Continued).
150
C
acremonium phylogeny
Acremonium inflatum CBS 403.70
99 Acremonium inflatum CBS 439.70
76 Acremonium inflatum CBS 212.69 T
100
inflatum
Nectriaceae/recifei-clade
“Acremonium luzulae” CBS 579.73
-clade
100
Scopinella solani
Acremonium roseolum CBS 289.62 T
Peethambara sundara
Albosynnema elegans
88 Didymostilbe echinofibrosa
98 Peethambara spirostriata
Sarcopodium circinatum 3
Sarcopodium circinatum 1
Myrothecium cinctum
Stachybotrys/Peethambara
Myrothecium inundatum
Myrothecium roridum 1
-clade
Myrothecium roridum 2
Myrothecium leucotrichum
86 Myrothecium verrucaria
Parasarcopodium ceratocaryi
Stachybotrys chartarum
78
Chaetosphaeria aterrima
96 Didymostilbe matsushimae
Melanopsamma pomiformis
76 Cosmospora lavitskiae CBS 530.68 T
Cosmospora episphaeria
80
“Acremonium aff. curvulum” CBS 100551 Cosmospora
86
Cosmospora vilior
Cosmospora khandalensis CBS 356.65 T
Acremonium recifei CBS 400.85
Acremonium recifei CBS 976.70
Acremonium recifei CBS 411.91
Acremonium recifei CBS 596.74
Acremonium recifei CBS 505.94
Acremonium recifei CBS 220.84
Acremonium recifei CBS 555.73
Acremonium recifei CBS 362.76
88 Acremonium recifei CBS 137.35 T
Acremonium recifei CBS 135.71
Acremonium recifei CBS 541.89
Acremonium recifei CBS 402.89
Acremonium recifei CBS 442.66
“Acremonium strictum” CBS 106.23
Fusarium dimerum
89
Fusarium domesticum
100 Fusarium oxysporum 1
91
Fusarium oxysporum 2
99
Fusarium
Fusarium verticillioides
Persiciospora africana
-clade
81 Nectria rigidiuscula
87 Fusarium falciforme
70
Fusarium solani
Fusarium lichenicola
Neocosmospora endophytica
Acremonium tsugae CBS 788.69 T
Cylindrocarpon cylindroides
89 Heliscus lugdunensis
Calonectria morganii
Nectria radicicola
Leuconectria clusiae
Dematiocladium celtidis
Nectria cinnabarina
90 “Acremonium recifei” CBS 485.77
“Acremonium recifei” CBS 482.78
“Acremonium recifei” CBS 110348
Nalanthamala diospyri T
Nalanthamala guajavae
85 100 Nalanthamala vermoesenii
Rubrinectria olivacea
‘Nectria’ rishbethii CBS 496.67 T
Acremonium exiguum CBS 587.73 T
96
“Acremonium implicatum” CBS 397.70B exiguum
92 “Acremonium potronii” CBS 416.68
-clade
93 “Acremonium potronii” CBS 781.69
Nectriopsis
squamulosa
1
100
Nectriopsis squamulosa 2
“Cephalosporium ballagii” CBS 134.33 T
pseudozeylanicum
97 “Acremonium aff. curvulum” CBS 113275
77 Acremonium pseudozeylanicum CBS 560.73 T -clade
Niesslia exilis 1
Acremonium nigrosclerotium CBS 154.72 T
Niesslia exilis 2
D
Fig. 2. (Continued).
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151
98
97
0.01 substitutions/site
Fig. 2. (Continued).
152
Cordycipitaceae
Clavicipitaceae
Hypocreaceae
80
Cordyceps ramosipulvinata
Melanospora brevirostris
100
83
Bertia moriformis
Phaeoacremonium aleophilum
Ophiocordyceps bispora
Elaphocordyceps longisegmentis
Haptocillium sinense
Haptocillium zeosporum
99 Paecilomyces lilacinus 2
Paecilomyces lilacinus 1
82 Isaria takamizusanensis
98 Chaunopycnis alba 1
Chaunopycnis alba 2
Chaunopycnis pustulata
Tolypocladium inflatum
Verticillium leptobactrum CBS 109351
94 Simplicillium lanosoniveum CBS 321.72
92
78 Simplicillium lanosoniveum
98
Simplicillium obclavatum T
Simplicillium lamellicola T
Beauveria bassiana
74
Cordyceps militaris
Pleurodesmospora coccorum
Isaria javanica
Syspastospora parasitica
91
Hyperdermium bertonii
Lecanicillium antillanum
Lecanicillium aranearum T
Lecanicillium fusisporum T
Lecanicillium psalliotae 1
Lecanicillium dimorphum T
Lecanicillium aff. psalliotae 2
Lecanicillium lecanii
Paecilomyces farinosus
Lecanicillium attenuatum
Epichloe typhina
Pochonia bulbillosa 2
Pochonia bulbillosa 1
99 Pochonia gonioides
Pochonia rubescens
Metarhizium anisopliae var. frigidum
Pochonia chlamydosporia var. catenulatum T
95 Verticillium epiphytum 2
Verticillium epiphytum 1
Torrubiella pruinosa
98 Torrubiella petchii
Echinodothis tuberiformis
Verticillium pseudohemipterigenum
Ophionectria trichospora
Torrubiella luteorostrata
Acremonium camptosporum CBS 756.69 T
Acremonium camptosporum CBS 835.91
camptosporum
Acremonium camptosporum CBS 757.69
Acremonium camptosporum CBS 677.74
99 Acremonium camptosporum CBS 890.85 -clade
Clypeosphaeria phillyreae
Blistum tomentosum
Neomunkia sydowii
Hypocrea koningii
Hypomyces chlorinigenus
Sphaerostilbella aureonitens
Sporophagomyces chrysostomus
81
Cladobotryum rubrobrunnescens
Hypomyces subiculosus
Mycogone rosea
Verticillium incurvum
Acremonium psammosporum CBS 590.63 T
Ceratocystis fimbriata
Ophiostoma piluliferum 2
Glomerella cingulata
Ophiocordycipitaceae
SuMMerbell et al.
e
acremonium phylogeny
Another major hypocrealean Acremonium clade in Fig. 1A
contains A. breve, A. radiatum, A. gamsii and, more distantly, with
96 % bootstrap support, A. curvulum. In Fig. 2C where phylogenetic
signal is lower, A. curvulum loses its tight association with A. breve
and its relatives and appears in unsupported juxtaposition with the
genus Trichothecium and the corresponding teleomorph genus,
Leucosphaerina. The clade containing Trichothecium roseum
and Leucosphaerina indica (see taxonomic comments below)
also contains two anamorph species that were long placed in
different genera based on conidiogenesis, namely, Acremonium
crotocinigenum and Spicellum roseum, here recombined into
Trichothecium.
The next clade in Fig. 1A is a loosely structured assemblage
consisting of members of Acremonium subgenus Gliomastix, some
of which are delineated below as members of a phylogenetically
delineated genus Gliomastix, plus the teleomorphic genera
Bionectria, linked to the well known penicillate hyphomycete
anamorph genus Clonostachys (Schroers 2001), Hydropisphaera,
and Roumegueriella. As Fig. 2B shows in more detail, the type
species of the genus Gliomastix, originally named Gliomastix
chartarum but currently called G. murorum, is in a relatively
well supported clade (92 % bootstrap support) along with G.
masseei, G. polychroma, and G. roseogrisa, three other species
with melanised conidia that were placed in Acremonium subg.
Gliomastix by Gams (1971). Related to Gliomastix are two clades of
non-melanised Acremonium species placed in A. subg. Gliomastix,
the A. persicinum clade, and A. pteridii clade. Smaller clades
containing species in A. subg. Gliomastix such as A. biseptum, A.
cerealis, A. luzulae, and A. rutilum (= A. roseum) are included in
the large Gliomastix/Bionectria clade, which has 78 % bootstrap
support. This clade includes additional teleomorphic fungi such as
Heleococcum, Hydropisphaera, Nectriopsis, Ochronectria, Selinia,
and Stephanonectria, along with the anamorph Sesquicillium
microsporum.
The Gliomastix/Bionectria clade, the sclerotigenum/Geosmithia
clade, and other members of the Bionectriaceae form a weakly
supported clade with 74 % bootstrap value as shown in Fig. 1A.
Included in the sclerotigenum/Geosmithia clade is the penicillate
anamorph genus Geosmithia sensu stricto and the ex-type isolates
of Acremonium pinkertoniae and A. sclerotigenum as well as the
cephalosporin-producer Acremonium chrysogenum and its close
relative, the thermophilic A. lavum. It also includes non-type
isolates identiied as A. blochii and A. egyptiacum. In the LSU-tree
(Fig. 2A) the sclerotigenum/Geosmithia clade includes an extensive
group of Acremonium species and cleistothecial Bionectriaceae
with Acremonium-like anamorphs, namely, Emericellopsis,
Hapsidospora, Mycoarachis, and Nigrosabulum. Among the
anamorphic species in this group are most of the phylogenetically
disparate isolates identiied as the type species of Acremonium,
A. alternatum. One of these, CBS 407.66, is designated below
as epitype of A. alternatum. Prominent subclades include the
Acremonium sclerotigenum clade containing the ex-type isolates of
A. sclerotigenum and A. sordidulum.
Another major, well supported bionectriaceous subclade
associated with the sclerotigenum clade is the Emericellopsis
clade (Fig. 2A). It includes the type species of the synnematal
hyphomycete genus Stilbella, S. imetaria (Seifert 1985) as
well as the type of Stanjemonium (Gams et al. 1998) and the
marine Acremonium tubakii sensu stricto and A. fuci (Zuccaro
et al. 2004). Stilbella imetaria is closely related to the ex-type
isolate of Acremonium salmoneum isolated from dung, also a
typical habitat for S. imetaria (Seifert 1985). An adjacent weakly
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supported clade includes Hapsidospora, Mycoarachis, and
Nigrosabulum, and the two Acremonium species named for yellow
pigmentation, A. chrysogenum and A. lavum. Although associated
with A. chrysogenum and A. lavum in Fig. 1B, A. pinkertoniae
and A. borodinense form a distinct clade in Fig. 2A along with an
isolate included in the polyphyletic A. blochii (CBS 993.69), plus
the cleistothecial teleomorphs Bulbithecium hyalosporum and
Leucosphaerina arxii, both of which have unnamed Acremonium
anamorphs. In Fig. 2A, the A. chrysogenum subclade appears
to be distinct from the other clades containing A. sclerotigenum,
Emericellopsis, and Geosmithia. The other clades within the overall
sclerotigenum/Geosmithia clade include the A. fusidioides clade
containing several acremonia forming similar conidial chains (A.
cavaraeanum, A. fusidioides, A. hansfordii, A. hennebertii, one of
the isolates labeled A. alternatum). A small A. brachypenium clade
associated with the A. sclerotigenum clade includes A. brachypenium
plus the ex-type strain of Cephalosporium purpurascens placed
by Gams (1971) in A. persicinum. There is also an isolate of the
polyphyletic, untypiied species A. potronii. Basal to these clades
is another small clade that links an entomogenous isolate identiied
as Verticillium insectorum with two isolates from human sources
identiied as A. blochii; these conidial chain-forming isolates are
sister to an isolate of the chain-forming entomogenous species
Acremonium zeylanicum. The “A. blochii” isolate CBS 427.93,
linked with a 99 % bootstrap value to A. pinkertoniae in Fig. 1B,
is one of the two isolates associated with Acremonium zeylanicum
in Fig. 2A.
Adjacent and loosely linked to the bionectriaceous clades in
Fig. 2B is a small clade in Fig. 2C containing the ex-type isolate of
Acremonium incrustatum plus an isolate labeled A. potronii, and a
sequence attributed to Linkosia fusiformis, although this sequence
most likely represents a contaminant.
Below the sclerotigenum/Geosmithia clade in Fig. 1A and
above the Hypocreaceae in Fig. 2E fall clades representing
the Clavicipitaceae sensu lato. These clades include the
families Clavicipitaceae sensu stricto, Ophiocordycipitaceae,
and Cordycipitaceae. Although many species in this group of
three families have Acremonium-like anamorphic states, only
two described Acremonium species are associated here. In
Fig. 2E A. camptosporum sits basally in a clade adjacent to the
Clavicipitaceae and is close to the poorly understood teleomorphic
species Clypeosphaeria phillyreae, assuming the latter is correctly
associated with the sequence attributed to it. Simplicillium
obclavatum, originally described as Acremonium obclavatum,
provides the only other clavicipitaceous species in Fig. 2
representing a named species of Acremonium.
Below the Clavicipitaceaceae in Fig. 1B is a clade of ambiguous
afinities containing Acremonium guillematii, A. minutisporum and
A. vitellinum. This group also appears as two to three unafiliated
clades in Fig. 2C. An insigniicant branch in Fig. 1B subtends
Acremonium exiguum, A. psammosporum, and an isolate identiied
as A. potronii. In Fig. 2D, just A. exiguum and the A. potronii entity
remain associated while Acremonium psammosporum segregates
into a basal hypocrealean clade of its own in Fig. 2E.
The Nectriaceae is represented by Nectria cinnabarina in
Fig. 1B along with the ex-type isolate of the tropical opportunistic
pathogen of humans, Acremonium recifei. Fig. 2D shows A. recifei
subtending multiple taxa with three non-type isolates splitting off
as a separate clade. These clades have approximately the same
status in the Nectriaceae as the genus Nalanthamala, including N.
diospyri, the former Acremonium diospyri. Another nectriaceous
Acremonium in Fig. 2D is A. tsugae, which is closely related
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to Cylindrocarpon cylindroides. The broad morphotaxonomic
concept of Acremonium berkeleyanum is polyphyletic consisting of
isolates placed in the nectriaceous genus Cosmospora (Fig. 2D).
Acremonium berkeleyanum sensu lato is represented in Fig. 2D by
the newly recombined Cosmospora species, C. lavitskiae and C.
khandalensis based on the ex-type isolates of Gliomastix lavitskiae
and Cephalosporium khandalense (Gräfenhan et al. 2011). Another
purported synonym of A. berkeleyanum, a Cadophora isolate
received as A. butyri CBS 301.38, falls outside the Hypocreales
(Fig. 1C).
Basally in the Hypocreales in Fig. 1B, Acremonium roseolum
appears in loose association with Stachybotrys species. In Fig.
2D, it appears in a clade along with the teleomorph Scopinella
solani and three Acremonium inlatum isolates, including CBS
403.70, an atypical, catenate-conidial isolate identiied at CBS as
A. atrogriseum. Nearby but statistically unlinked clades include
Stachybotrys and allied fungi such as Peethambara spirostriata
and Didymostilbe echinoibrosa (Castlebury et al. 2004).
Acremonium nigrosclerotium represents an isolated
Acremonium near the families Hypocreaceae and Niessliaceae
(Fig. 1B). In Fig. 2D, A. nigrosclerotium is intercalated among
two genotypes ascribed to N. exilis, and loosely associated (77
% bootstrap) with Acremonium pseudozeylanicum and the type
culture of Cephalosporium ballagii, currently in synonymy with
Acremonium charticola (Gams 1971).
A distant outlier is Acremonium lichenicola at the bottom of Fig.
1C. This isolate, CBS 425.66, chosen to represent this species in
lieu of ex-type material, blasts as a pezizalean fungus with afinities
to another hyaline, phialidic fungus, Phialophora alba.
A number of genera in addition to Acremonium were
investigated for possible afinity with Acremonium clades as shown
in Fig. 2. The sporodochial genus Sarcopodium was investigated
and found to split into two groups (Fig. 2C, D). One isolate identiied
as S. circinatum grouped with Sarcopodium circinosetiferum and
S. vanillae in a widely separated clade along with Lanatonectria
teleomorphs and a sequence identiied as Pseudonectria
rousseliana (Fig. 2C). This clade appeared in LSU sequencing to
be independently situated within the Hypocreales. Acremonium
rhabdosporum appeared as a statistically unsupported, possible
distant relative. The other two isolates of S. circinatum formed a
clade near Myrothecium in the Stachybotrys/Peethambara clade
(Fig. 2D). Also appearing in this clade was Parasarcopodium
ceratocaryi, a monotypic genus recently described by Mel’nik et
al. (2004).
DIsCUssION
The main morphotaxonomic groundwork for Acremonium as
conceived in the late 20th century was laid by Gams (1971)
in his monograph Cephalosporium-artige Schimmelpilze
(Hyphomycetes). This monograph was radically more
comprehensive than previous treatments of the species and was
followed by several key adjunct studies, including but not limited to
Gams & Lacey (1972), Gams (1975), and Ito et al. (2000). Gams’
studies were based on a meticulous morphological observation
scheme that involved growing species on appropriate media, e.g.,
oatmeal agar, and then making camera lucida drawings that could
be directly compared with subsequent isolates. The comparison
was done by superimposing the virtual image of the new isolate
directly over the camera lucida drawings of previous isolates drawn
154
at the same scale. This highly rigorous approach was necessary
for a group of hyphomycetous fungi so morphologically simpliied
as Acremonium.
Gams (1971, 1975) also discovered a subtle character that
allowed him to associate dark-conidial species, monographed
by Dickinson (1968) as the genus Gliomastix, with numerous
biologically related hyaline-conidial species. This character was
"chondroid hyphae," which could be seen under the microscope as
hyphae with wall thickenings, and which makes colonies somewhat
resistant to being cut with a scalpel. The species Gams (1971)
united using this character are, for the most part, grouped in the
Gliomastix/Bionectria clade referred to earlier in this study.
Despite the rigorous approach and the discovery of new, useful
characters, a number of the morphotaxonomic species names
ultimately were applied in the CBS collection to phylogenetically
divergent organisms. Six distinct taxa from CBS investigated in
this study were identiied as A. persicinum; three are now seen
phylogenetically to fall within the Gliomastix clade and three sort
elsewhere. These taxa are mostly directly visible as A. persicinum
isolates in Fig. 2. Names without quotation marks are consistent
with the type, while names in quotation marks sort into other
phylogenetic groups. An exception is represented by CBS 149.62.
This isolate, the ex-type of Cephalosporium purpurascens, was
listed by Gams (1971) as a synonym of A. persicinum. Five taxa
in Fig. 2 were labeled A. potronii in CBS, and four were called
A. strictum. Within both A. potronii and A. strictum, as conceived
morphologically, some isolates fall within A. sclerotigenum. The
name A. alternatum was applied to four species, three of them
visible in Fig. 2, plus isolates of A. sclerotigenum with catenulate
conidia. “Acremonium blochii” was applied to three different
species.
Phylogenetic analysis compared to the
morphological treatment of Acremonium
Gams (1971, 1975) divided Acremonium into three major sections,
Simplex, a name later updated as the type section Acremonium,
Gliomastix, and Nectrioidea. Of these sections, only Gliomastix
withstands phylogenetic scrutiny as a unit, albeit a loosely
associated one.
The type section Acremonium contained four widely
phylogenetically scattered major clades (Fig. 2), speciically the A.
sclerotigenum clade, Sarocladium clade, A. curvulum clade, and A.
breve clade. As seen best in Fig. 1, the Sarocladium clade and the
A. breve and A. curvulum clades comprise a distinct group that falls
within the Hypocreales but outside any currently recognised family.
Acremonium sclerotigenum falls into a distinct clade within the
Bionectriaceae that also contains Emericellopsis and Geosmithia.
This clade also includes about half the investigated CBS isolates
identiied as the type species of Acremonium, A. alternatum,
including CBS 407.66 as well as some isolates such as CBS 223.70
revealed as morphological variants of A. sclerotigenum. Despite
the substantial phylogenetic distance between A. sclerotigenum
and A. strictum, relatively glabrous, cylindrical-conidial isolates
of A. sclerotigenum not producing sclerotia on special media
(lupine stem agar according to Gams, 1971, later replaced at
CBS by nettle stem agar) are essentially micromorphologically
indistinguishable from A. strictum. Table 1 shows CBS 287.70 O
as an A. sclerotigenum isolate identiied in CBS as A. strictum; ITS
sequencing studies of additional strains (data not shown) have
found two more such isolates, CBS 319.70 D and CBS 474.67.
acremonium phylogeny
The convergence among isolates of phylogenetically remote
species is remarkable. An unknown proportion of the literature on
A. strictum is based on studies of A. sclerotigenum. For example,
in a study inluential in medical mycology, Novicki et al. (2003)
labeled ITS-sequenced isolates of A. sclerotigenum in GenBank
as "Acremonium strictum genogroup II." The complexity of A.
sclerotigenum, not its earliest valid name, goes beyond the scope
of this paper. Perdomo et al. (2010) have recently investigated the
diversity of medically important isolates within this species.
Besides the four clades mentioned above, Acremonium
sect. Acremonium species also make up the non-synnematal
anamorphs of the Emericellopsis clade, most of the A. fusidioides
clade, and most of the small A. camptosporum, A. exiguum, A.
minutisporum, A. pinkertoniae, and A. pseudozeylanicum clades.
Gams (1975) accommodated A. byssoides, now known to belong
in Simplicillium lanosoniveum (Zare & Gams 2001), in Acremonium
sect. Acremonium, while commenting that it was suggestive of
Verticillium sect. Prostrata, later recognised as Simplicillium (Zare
& Gams 2001). He withheld A. byssoides from Verticillium because
the colony margin was relatively lat and slightly fasciculate, rather
than cottony. To some extent Acremonium sect. Acremonium was
based on keying out all the relatively lat or fasciculate Acremoniumlike species together provided that they lacked the dark conidia or
chondroid hyphae of Gliomastix.
Acremonium sect. Nectrioidea as delineated by Gams (1971)
included many Nectria sensu lato anamorphs. Some of these
species are now placed in the genus Cosmospora by Gräfenhan et
al. (2011). These include members of the A. berkeleyanum complex
as well as A. arxii and A. cymosum. Acremonium falciforme in A.
sect. Nectrioidea had already been recognised as a member of
the Fusarium solani complex (Summerbell & Schroers 2002) and
A. diospyri had been transferred into Nalanthamala along with
other nectriaceous species (Schroers et al. 2005). Acremonium
tsugae appears to be a microconidial Cylindrocarpon species. The
Acremonium recifei complex still remains as an undisposed major
group of nectriaceous Acremonium species originally included in
A. sect. Nectrioidea. The placement of A. sect. Nectrioidea species
A. alcalophilum, A. brunnescens, A. furcatum, A. nepalense, A.
restrictum, and A. stromaticum in the Plectosphaerellaceae has
already been shown by Zare et al. (2007). Acremonium apii also
has been shown to belong to this family as a synonym of Verticillium
alboatrum, and its ex-type strain, CBS 130.51, was used as the
representative isolate of that species by Zare et al. (2007).
Other anomalous elements of A. sect. Nectrioidea include
A. crotocinigenum in the Trichothecium clade, A. radiatum in the
phylogenetically isolated A. breve clade, A. biseptum in the A.
cerealis clade near Gliomastix, A. salmoneum in the Emericellopsis
clade near Stilbella imetaria, A. chrysogenum in a bionectriaceous
clade containing cleistothecial teleomorphs such as Nigrosabulum,
A. rutilum in a clade otherwise containing isolates identiied as A.
persicinum, and a non-type A. hyalinulum isolate in another clade
peripheral to Gliomastix. When Sarocladium zeae as A. zeae in
A. sect. Nectrioidea was compared to the phylogenetically related
S. kiliense as A. kiliense in A. sect. Acremonium by Gams (1971,
p. 16), he noted that the latter species may sometimes also be
strongly branched and thus resemble the former. The exigencies
of dichotomous morphological keying tended to sort closely related
species into widely separated Sections of the genus.
The main heterogeneous element included in Gams’ (1971)
original concept of sect. Gliomastix was the “Striatisporum series.”
These were later distinguished as the separate genus Sagenomella
(Gams 1978). Both Sagenomella and the recently described genus
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Phialosimplex are members of the Eurotiales (Sigler et al. 2010).
Another anomalous element in sect. Gliomastix, Acremonium
atrogriseum, is here removed to the Cephalothecaceae.
Other species included by Gams (1971, 1975) in A.
sect. Gliomastix that can now be seen to be separated from
the Gliomastix/Bionectria clade include “Cephalosporium
purpurascens,” synonymised by Gams (1971) with A. persicinum
as well as A. brachypenium, A. hennebertii, A. incrustatum, and
A. inlatum. Species outside the Gliomastix/Bionectria clade that
have well developed chondroid hyphae include A. hennebertii and
A. incrustatum.
TAxONOMy
The main purpose of this study is to provide a phylogenetic overview
of Acremonium plus distinctive LSU sequences to render the
described species recognisable in molecular studies. In addition,
some taxonomic changes are undertaken.
What is Acremonium?
The irst task at hand is to establish what Acremonium is. The
lectotype species of Acremonium is A. alternatum as designated
by Gams (1968). Gams (1968) studied and illustrated the type
material used by Link (1809) in describing A. alternatum. This
material consists of a thin fungal mycelium colonising a birch leaf.
In choosing living cultures that best approximated this specimen,
Gams (1968) listed four isolates. From among these, one is chosen
with a dried culture to be designated here as the epitype with an
ex-epitype culture. This is CBS 407.66, which groups with the extype isolate of Cephalosporium malorum, synonymised by Gams
(1971) with A. charticola, as well as with A. sordidulum and A.
charticola in the poorly deined A. sclerotigenum/Geosmithia clade.
Use of the corresponding dried culture CBS H-20525 as an epitype
specimen serves nomenclatural stability because the genus name
Acremonium is then used to designate a large group of species
currently accepted in Acremonium.
Other candidate isolates included CBS 308.70 (called "Kultur
1127"), which died out and was replenished from its degenerated,
nonsporulating subculture MUCL 8432, now also called CBS
114602. As a degenerated isolate, it makes poor potential epitype
material. Another isolate mentioned by Gams (1968), CBS 406.66,
is conspeciic with CBS 114602 and in good condition. Both
isolates are included in a clade relatively distant from any other
Acremonium group but deeply basal to the Sarocladium and A.
breve clades, as seen in Fig. 1A. If Acremonium were epitypiied
with one of these isolates, the generic name might be restricted
to this single species. The inal isolate is CBS 223.70, an isolate
that, despite its catenate conidia, is conspeciic with the type of A.
sclerotigenum (100 % ITS sequence identity; GenBank AJ621772
for CBS 124.42 is essentially identical to A. sclerotigenum,
U57674, CBS 223.70). Isolate CBS 223.70 strongly resembles pale
greenish grey coloured, sclerotium-forming isolates identiied as A.
egyptiacum (e.g., CBS 734.69), which are also conspeciic with A.
sclerotigenum. It differs by not forming sclerotia. Catenate conidia
may or may not be produced in this group and the greenish grey
colonies produced by chain-forming isolates have explicitly been
connected with A. egyptiacum, not A. alternatum. One other taxon
that Gams (1971, 1975) consistently identiied as A. alternatum, a
species in the A. fusidioides clade, is represented by CBS 831.97
155
SuMMerbell et al.
and 381.70A. These isolates have the disadvantage of not having
been explicitly compared with the type material. In addition, this
clade is related to several clades with known teleomorphs, e.g.,
Emericellopsis and Nigrosabulum, and anamorphs, e.g., Stilbella
and Geosmithia. In a revised nomenclatural system, it would root
Acremonium as a broad unitary genus name encompassing the
teleomorphs and complex anamorphs. Ultimately, it might epitypify
Acremonium strictly as a genus name for the A. fusidioides clade.
Acremonium alternatum Link : Fr., Mag. Ges. naturf. Fr.
Berlin 3: 15. 1809 : Fries, Syst. Mycol. 3: 425. 1832.
Holotype: Germany, Rostock, on leaf litter of Betula, collected by
Ditmar, B-type specimen labeled in Link’s handwriting.
Epitype designated here: Austria, Stangensteig near Innsbruck, ex
Ustulina deusta, W. Gams, Dec. 1965, CBS-H 20525 dried culture
of CBS 407.66, ex-epitype living culture CBS 407.66.
Additional genera recognised here
1958). The distinction between G. murorum var. murorum having
conidia in chains and G. murorum var. felina having conidia in
mucoid heads does not appear to be supported by phylogenetic
analysis. Gliomastix murorum var. felina isolates originally
described as Graphium malorum (ex-type CBS 154.25) and Torula
cephalosporioides (ex-type CBS 378.36) are molecularly conirmed
as synonyms of G. murorum (Fig. 2B). Recently, Kiyuna et al.
(2010) neotypiied Gliomastix felina (Marchal) Hammill, recombined
as Acremonium felinum (Marchal) Kiyuna, An, Kigawa & Sugiy.,
with CBS 147.81. The sequences deposited in GenBank, e.g.,
AB540562, suggest that this isolate represents G. roseogrisea. The
new combination is reduced to synonymy with that species below.
2. Gliomastix masseei (Sacc. ) Matsush., Icon. microfung.
Matsush. lect. (Kobe): 76. 1975.
Basionym: Trichosporium masseei Sacc., Syll. Fung. 22: 1356.
1913
[= Trichosporium aterrimum Massee, Bull. Misc. Inform. 1899: 167 non
(Corda) Sacc. 1886]
≡ Acremonium masseei (Sacc.) W. Gams, Cephalosporium-artige
Schimmelpilze (Stuttgart): 83. 1971.
Based on these analyses, three genera are represented in suficient
detail and with high bootstrap support to be formally recognised here.
In most cases, the genera and clades are not suficiently populated
with their constituent members without analysis of additional
sequences. For example, the Emericellopsis clade is missing 12 of
its 13 species including two identiied as E. minima (Zuccaro et al.
2004) as well as one of its two Stanjemonium species.
The name lacks an ex-type isolate. Although the isolate (CBS
794.69) sequenced is basal to the Gliomastix clade (Fig. 2B), it
appears to be a suitable to serve as the basis for epitypiication.
Gliomastix
Epitype designated here: Italy, Turin, isolated from rabbit dung, A.
Fontana, CBS H-8244, ex-epitype culture CBS 794.69.
The core clade of Gliomastix including the type species is well
delimited with a 92 % bootstrap value even in the very conservative
LSU analysis. Although Gams (1971) placed this genus into
Acremonium, several authors have recognised Gliomastix. Most
notably, Matsushima (1975) placed Acremonium masseei and A.
polychromum into Gliomastix and Lechat et al. (2010) linked G.
fusigera with Hydropisphaera bambusicola. As circumscribed in
this paper, the phylogenetically supported Gliomastix differs from
previous morphological concepts by excluding several distantly
related species such as Acremonium cerealis and A. inlatum.
The closely related A. persicinum clade may also be included as
suggested by Supplemental ig. 6E in Schoch et al. (2009) and
discussed above. At the moment, we recognise only four species
from the present study in Gliomastix. An additional species,
published while the present manuscript was in preparation,
Acremonium tumulicola (Kiyuna et al. 2010), should also be
included in this concept of Gliomastix.
The generic characters do not differ signiicantly from those
summarised in the generic diagnosis of Dickinson (1968).
1. Type species. Gliomastix murorum (Corda) S. Hughes,
Canad. J. Bot. 36: 769. 1958.
Basionym: Torula murorum Corda, Icon. Fung. 2: 9. 1838.
≡ Sagrahamala murorum (Corda) Subram., Curr. Sci. 41: 49. 1972.
≡ Acremonium murorum (Corda) W. Gams, Cephalosporium-artige
Schimmelpilze (Stuttgart): 84. 1971.
= Torula chartarum Corda, Icon. Fung. 2: 9. 1839.
≡ Gliomastix chartarum (Corda) Guég, Bull. Soc. Mycol. France 21: 240.
1905.
For additional synonyms, see Gams (1971). The type species of
Gliomastix, G. chartarum, is a synonym of G. murorum (Hughes
156
Holotype of Trichosporium masseei: India, Punjab, Changa Manga,
on Morus indica, Jan. 1898, J. Gleadow, ex Herb. Massee, K;
isotypes IMI 49,214 = IMI 87,346.
3. Gliomastix polychroma (J.F.H. Beyma) Matsush., Icon.
microfung. Matsush. lect. (Kobe): 77. 1975.
Basionym: Oospora polychroma J.F.H. Beyma, Verh. K. Ned. Akad.
Wetensch., Sect. 2, 26 (2): 5. 1928.
≡ Sagrahamala polychroma (J.F.H. Beyma) Subram., Curr. Sci. 41: 49.
1972.
≡ Acremonium polychromum (J.F.H. Beyma) W. Gams, Cephalosporiumartige Schimmelpilze (Stuttgart): 81. 1971.
Additional synonyms are given by Gams (1971). This clade
includes the ex-type isolate of Oospora polychroma, basionym of
G. polychroma, CBS 181.27 (Fig. 2B). Periconia tenuissima var.
nigra is conirmed as a synonym via inclusion of its ex-type isolate
CBS 151.26 (Fig. 2B). The status of the different isolate, CBS
617.94, from banana, requires further clariication. This isolate may
be related to Acremonium musicola, a species not represented in
CBS.
4. Gliomastix roseogrisea (S.B. Saksena) Summerbell,
comb. nov. MycoBank MB519588.
Basionym: Cephalosporium roseogriseum
Mycologia 47: 895. 1956 [1955].
S.B.
Saksena,
≡ Acremonium roseogriseum (S.B. Saksena) W. Gams [as ‘roseogriseum’], Cephalosporium-artige Schimmelpilze (Stuttgart): 87. 1971.
= Acremonium felinum (Marchal) Kiyuna, An, Kigawa & Sugiy., Mycoscience
52: 13. 2010.
Gliomastix roseogrisea, like G. murorum, has a variety of conidial
forms including conidia in chains and conidia of various shapes in
mucoid heads. This plasticity of form recalls the situation mentioned
acremonium phylogeny
above for A. sclerotigenum and may represent a relatively common
situation in acremonioid species. As another example Gams (1971)
lists “Gliomastix murorum var. felina pro parte in Dickinson in Mycol
Pap. 115: 16, 1968” as an additional synonym of this taxon.
As mentioned above in the discussion of the genus, Kiyuna
et al. (2010) recently neotypiied Gliomastix felina (basionym
Periconia felina Marchal, Bull. Soc. R. Bot. Belg. 34:141. 1895) with
CBS 147.81, an isolate collected by Hammill (1981). This isolate
is a typical G. roseogrisea, a taxon not studied by Kiyuna et al.
(2010).
5. Gliomastix tumulicola (Kiyuna, An, Kigawa & Sugiy.)
Summerbell, comb. nov. MycoBank MB519599.
Basionym: Acremonium tumulicola Kiyuna, An, Kigawa & Sugiy.,
Mycoscience 52: 13. 2010.
This newly described species is phylogenetically placed by its
original authors (Kiyuna et al. 2010) in the Gliomastix clade and
comparison of sequences conirms that placement. Although this
information was received too late to include this species in our
phylogenetic analyses, the species is placed in Gliomastix.
Sarocladium
The genus Sarocladium was described for two pinkish coloured
fungal pathogens causing sheath blast of rice (Gams & Hawksworth
1976). The drawings in that paper and the photographs in Bills et
al. (2004) show structures that overlap with those produced by the
phylogenetically related A. kiliense, A. strictum, and A. zeae. As in
Fusarium, plant pathogenic fungi that sporulate on above-ground
plant parts are likely to produce upright, branching sporulating
structures with mucoid conidia suggesting dispersal by insects
that ly from plant to plant. Species with habitats where water
lux or microarthropod movement may be important in dispersal,
e.g., various Acremonia occurring in soil or Fusarium domesticum
growing on cheese, may have simpliied conidiogenous structures.
Bills et al. (2004) suggested that the generic placement of
Acremonium kiliense and A. strictum should be re-examined in light
of their close relationship with Sarocladium oryzae.
The genus Sarocladium is delineated here to include several
species previously recognised in Acremonium, as seen in Figs 1 and
2. In Fig. 2, where phylogenetic signal is relatively low, Sarocladium
tepidly (84 % bootstrap) links to the A. bacillisporum clade. In Fig. 1, it
links with a 99 % bootstrap value. Phylogenetic clustering algorithms
often insert the A. bacillisporum clade between A. strictum and A.
kiliense due to certain apo- or plesiomorphies shared with one or the
other of these two members of the A. strictum clade (data not shown).
On the other hand, the next most closely related clade in Fig. 1, the
A. breve/A. curvulum clade, has ITS sequences with substantial
sections that are dificult to align with those of the A. bacillisporum
and A. strictum clades, indicating considerable evolutionary distance.
The genus Sarocladium is emended here to include those
species that belong to the A. strictum and A. bacillisporum clades.
The generic name Sagrahamala is not a contender for this group
because the type species is the unrelated Acremonium luzulae. In
addition Acremonium luzulae is a species in need of epitypiication,
because, as shown in the present study, more than one phylogenetic
species is encompassed under the name.
Sarocladium W. Gams & D. Hawksw., Kavaka 3: 57. 1976
[1975].
www.studiesinmycology.org
Colonies on 2 % malt extract agar slimy-glabrous to moderately
loccose to deeply dusty, sometimes ropy; with, in Gams’
terminology (Gams 1971), phalacrogenous, nematogenous, to
plectonematogenous conidiation; growing 13–25 mm in 10 d at
20 °C, whitish to pinkish to salmonaceous or, when conidia are
formed in chains, sometimes acquiring vivid conidial mass colouration
such as ochraceous or greenish glaucous; reverse pale to pinkish
orange to pale grey-brown, rarely greenish-blue. Conidiogenous
apparatus ranging from adelophialides, solitary orthotropic phialides
to conidiophore structures with one or a few branches, or with
cymose branching or occasionally with one or two ranks of loosely
structured verticils, sometimes with repeated branching extending to
90 μm long. Phialides subulate, aculeate to acerose, straight, slightly
curved, or undulate, thin- and smooth-walled, 15–60(–75) μm long,
tapering from a basal width of 1.2–2.5 μm, with minimal collarette;
conidia borne in mucoid heads or dry chains, notably longer than
broad, l/w mostly 2.2–7.0, cylindrical to fusiform to bacilliform,
aseptate, smooth-walled, with rounded or tapered-truncate ends,
3.5–8(–14) × 0.5–2 μm. Chlamydospores present or absent, when
present relatively thick-walled, smooth or slightly roughened, globose
to ellipsoidal, intercalary or terminal, mostly solitary, occasionally in
short chains, 4–8 μm. Internal transcribed spacer sequence mostly
with distinctive CGGTCGCGCC motif in mid-ITS2 region.
Several species of Sarocladium are noted for melanogenesis
yielding ochre-brown to dark grey-brown colony reverse colours on
Sabouraud agar: S. glaucum, S. kiliense, and S. zeae (Gams 1971).
In the case of S. kiliense, this melanogenesis has the result that
most mycetoma cases feature black "grains" or sclerotium-like balls
of compacted fungal hyphae (Summerbell 2003); melanogenesis
is a well known pathogenicity factor in fungal diseases of humans
and animals (Gómez & Nosanchuk 2003). As recognised here
Sarocladium yields a remarkable unity of species with elongated
conidia and phialides. Several species including S. kiliense, S.
oryzae, and S. strictum form adelophialides prominently, at least in
some isolates; acremonioid species outside Sarocladium usually
lack this character.
The recognised species are given below. Acremonium
implicatum may belong here, but the species lacks living ex-type or
representative material. The “A. implicatum” isolate that grouped in
Sarocladium, CBS 243.59, is noted by Gams (1971) as an authentic
isolate of Fusidium terricola J.H. Mill., Giddens & A.A. Foster and
this name could be used if A. implicatum sensu Gams is revealed
as polyphyletic. The other “A. implicatum” isolate, CBS 397.70B,
included in this study is not a Sarocladium; rather it is a member of
the A. exiguum clade.
1. Type species. Sarocladium oryzae (Sawada) W. Gams &
D. Hawksw., Kavaka 3: 58. 1976 [1975].
A description and synonymy are given by Gams & Hawksworth
(1975). Bills et al. (2004) synonymised Sarocladium attenuatum with
S. oryzae based on the reported identity of the ITS sequence of its
ex-type isolate, CBS 399.73, with that of representative isolates of S.
oryzae. We resequenced the ITS region of CBS 399.73 and obtained
a sequence differing from Bills et al. (AY566995) by 6 base-pairs
and 2 gaps. Some of the base pairs in our sequence appeared to
be symplesiomorphies shared with A. kiliense or A. strictum but not
S. oryzae, rather than random mutations or possible miscalls. Our
resequencing of unequivocal S. oryzae isolates CBS 180.74 and
CBS 361.75 yielded results consistent with those of Bills et al. (2004).
The status of S. attenuatum thus requires further study.
157
SuMMerbell et al.
2. Sarocladium bacillisporum (Onions & Barron)
Summerbell, comb. nov. MycoBank MB519589.
Basionym: Paecilomyces bacillisporus Onions & G.L. Barron,
Mycol. Pap. 107: 11. 1967.
≡ Acremonium bacillisporum (Onions & G.L. Barron) W. Gams,
Cephalosporium-artige Schimmelpilze (Stuttgart): 72. 1971.
≡ Sagrahamala bacillispora (Onions & G.L. Barron) Subram., Curr. Sci.
41: 49. 1972.
This species was described by Gams (1971). It is easily confused
with Verticillium leptobactrum, which can be relatively loccose and
loosely structured although some isolates are very dense and slowgrowing (Gams, 1971). In addition colonies of S. bacillisporum at
maturity have a pinkish colouration.
3. Sarocladium bactrocephalum (W. Gams) Summerbell,
comb. nov. MycoBank MB519590.
Basionym:
Acremonium
bactrocephalum
W.
Gams,
Cephalosporium-artige Schimmelpilze (Stuttgart): 44. 1971.
As indicated by Gams (1971) this uncommon species is closely
related to S. strictum, but is distinguished morphologically by its
long, narrow conidia. It is molecularly distinguishable by LSU
sequences.
4. Sarocladium glaucum (W. Gams) Summerbell, comb.
nov. MycoBank MB519591.
Basionym: Acremonium glaucum W. Gams, Cephalosporium-artige
Schimmelpilze (Stuttgart): 68. 1971.
This species was described by Gams (1971). The ex-type culture
CBS 796.69 indicates that this species belongs in Sarocladium.
5. Sarocladium kiliense (Grütz) Summerbell comb. nov.
MycoBank MB519592.
Basionym: Acremonium kiliense Grütz, Dermatol. Wochenschr. 80:
774. 1925.
= Cephalosporium incoloratum Sukapure & Thirum., Sydowia 19: 171. 1966
[1965].
= Acremonium incoloratum (Sukapure & Thirum.) W. Gams, Cephalosporiumartige Schimmelpilze (Stuttgart): 50. 1971.
Additional synonyms and a description of S. kiliense are given
by Gams (1971) and Domsch et al. (2007); the species is also
extensively illustrated by de Hoog et al. (2000). The ITS sequence
of the ex-type strain of Acremonium incoloratum, CBS 146.62, is
identical to that of the ex-type of S. kiliense, CBS 122.29 (data not
shown). Though isolate CBS 146.62 is unusual in colour and lacks
well differentiated chlamydospores that generally occur in S. kiliense,
there is no phenetic difference profound enough to suggest that
additional genes must be examined to be certain of their synonymy.
The sequences deposited in GenBank by Novicki et al. (2003)
for their “Acremonium strictum genogroup III” (ITS: AY138846;
LSU: AY138484) are actually of S. kiliense.
6. Sarocladium ochraceum (Onions & Barron) Summerbell,
comb. nov. MycoBank MB519593.
Basionym: Paecilomyces ochraceus Onions & G.L. Barron, Mycol.
Pap. 107: 15. 1967.
≡ Acremonium ochraceum (Onions & G.L. Barron) W. Gams,
Cephalosporium-artige Schimmelpilze (Stuttgart): 67. 1971.
≡ Sagrahamala ochracea (Onions & G.L. Barron) Subram. & Pushkaran,
Kavaka 3: 89. 1975 [1976].
158
This species was described by Gams (1971). We analysed the extype culture, CBS 428.67.
7. Sarocladium strictum (W. Gams) Summerbell, comb.
nov. MycoBank MB519594.
Basionym: Acremonium strictum W. Gams, Cephalosporium-artige
Schimmelpilze (Stuttgart): 42. 1971.
Descriptions of S. strictum are given by Gams (1971) and Domsch
et al. (2007). The type isolate of S. strictum was conirmed in this
genus (Fig. 2C). Of the three isolates illustrated by Gams (1971)
under A. strictum, CBS 287.70 D, is conirmed by sequencing
as S. strictum. The only isolate of Acremonium zonatum in this
study, CBS 565.67, turned out to have an ITS sequence identical
to that of S. strictum. This is one of three isolates examined by
Gams (1971) as A. zonatum. He stated that another isolate,
CBS 145.62, appeared to be A. kiliense, but that examination of
herbarium material suggested that this species had been growing
on the natural substrate mixed with the real A. zonatum and had
been isolated accidentally. One herbarium specimen examined by
Gams (1971) showed septate conidia, something not otherwise
seen in Sarocladium, so there may indeed be a real A. zonatum.
It is not clear if A. zonatum sensu Gams is a uniied concept or
a designation of various acremonioid fungi forming leaf spots on
tropical plants. In any case, the known connection of the genus
Sarocladium with phytopathogenesis and endophytism as in S.
zeae makes it plausible that species such as S. strictum and S.
kiliense may play a role in plant disease.
8. Sarocladium zeae (W. Gams & D.R. Sumner) Summerbell,
comb. nov. MycoBank MB519595.
Basionym: Acremonium zeae W. Gams & D.R. Sumner, in Gams,
Cephalosporium-artige Schimmelpilze (Stuttgart): 121. 1971.
This economically important maize endophyte species its the
description given by Gams (1971) as a fungus with felty to shaggy
colonies. Two S. zeae isolates with more lattened colonies were
accessed in CBS as A. strictum. Both CBS 646.75 and 226.84 were
from maize and found to be producers of pyrrocidine metabolites
as well as dihydroresorcylide, characteristic of S. zeae (Wicklow
et al. 2008). Pyrrocidines are antagonistic to Aspergillus lavus
and Fusarium verticillioides in maize inlorescences and are thus
important in the ecology and economic signiicance of S. zeae.
An additional A. strictum isolate, CBS 310.85, is also S. zeae
as evidenced by pyrrocidine production, but has not yet been
sequenced (Wicklow et al. 2008).
Trichothecium
A signiicant theme of the current volume is the pioneering of a new
approach to dikaryomycete nomenclature: the unitary naming of
genus-level clades based on the oldest valid generic name, whether
originally anamorphic or teleomorphic in nature (see discussion in
Gräfenhan et al. 2011). Because the irst named fungi were often
species prominently in contact with humans and their environs
and because the irst names usually were attached to the most
frequently seen reproductive state, there is considerable wisdom to
using the oldest name applied to either aspect of the holomorph in
constructing a unitary nomenclature.
The genus Trichothecium makes an excellent example,
since the system used here preserves the best known species
name in the group. A unitary system giving teleomorphs primacy
acremonium phylogeny
Fig. 3. A. Trichothecium roseum CBS 113334 showing retrogressive conidiation. B-D. conidiogenesis in “Trichothecium indicum”/ Leucosphaerina indica CBS 123.78 showing
retrogressive development (B), phialidic development (B) and sympodial development (D).
would replace the familiar "T. roseum" with a Leucosphaerina
name. A system that retains primacy for morphology, which is
the only reasonable basis for dual nomenclature in the molecular
era, would divide the Trichothecium clade into four genera, as
is the case today. One of those genera, Acremonium, would be
quintessentially artiicial and almost completely divorced from
evolutionary biological relationships. With increased emphasis on
genomes, proteomes, and metabolomes, a focus on polyphyletic
elements of microscopic shape seems counterproductive. Every
new system of nomenclatural change will entail both fortunate and
infelicitous changes and will receive some resistance in scientiic
communities. A nomenclatural system based on phylogeny will be
considerably more stable than any previous system. The interests
of all would be best served if it bridged gracefully out of prephylogenetic taxonomy, preserving as many familiar elements as
possible. Trichothecium roseum, a constant from 1809 to today, is
one of those elements that is worthy of being preserved.
The small, tightly uniied clade of Trichothecium includes
isolates with three different anamorphic forms, currently classiied as
Acremonium (phialoconidia), Spicellum (sympodial blastoconidia),
and Trichothecium (retrogressive blastoconidia). The associated
teleomorph, Leucosphaerina indica, produces anamorphic forms
described as “Acremonium or Sporothrix” (Suh & Blackwell 1999).
These morphs are illustrated by von Arx et al. (1978). The range of
anamorphic forms produced by L. indica overlaps those produced
by all the anamorphic species in the clade (Fig. 3).
The four species studied here, Trichothecium roseum,
Acremonium crotocinigenum, Leucosphaerina indica, and Spicellum
roseum, have recently been associated with a ifth, newly described
species, Spicellum ovalisporum. The dendrogram produced by
Seifert et al. (2008) makes it clear that S. ovalisporum is related to
S. roseum and is certainly a member of the Trichothecium clade. In
parallel with the revision of the genus Microcera by Gräfenhan et al.
(2011), this clade is redeined here as a genus with the oldest valid
generic name, Trichothecium.
As Fig. 2 shows, the second described Leucosphaerina
species, L. arxii, is in the distant Acremonium pinkertoniae clade
and is closely related to Bulbithecium hyalosporum. Malloch (1989)
www.studiesinmycology.org
commented that it differed from L. indica by lacking sheathing gel
around the ascospores and by having an Acremonium anamorph.
Trichothecium Link : Fr., Mag. Gesell. naturf. Freunde,
Berlin 3: 18. 1809.
= Spicellum Nicot & Roquebert, Revue Mycol., Paris 39: 272. 1976 [1975].
= Leucosphaerina Arx, Persoonia 13: 294. 1987.
Older synonymy for the genus is given by Rifai & Cooke (1966).
Colonies on malt extract agar 20–40 μm after 7 d at 24 °C, white
to salmon orange or salmon pink (Methuen 6-7A2, 4-5A2-3), felty,
loccose or lanose, sometimes appearing powdery with heavy
conidiation. Ascomatal initials, if present, produced on aerial
mycelium, irregularly coiled. Ascomata spherical or nearly so, nonostiolate, colourless or slightly pink, 150–300 μm; ascomatal wall
persistent, nearly colourless, 10–13 μm thick, of indistinct hyphal
cells; asci uniformly distributed in centrum, clavate to spherical,
with thin, evanescent walls, 8-spored, 10–13 μm wide; ascospores
ellipsoidal or reniform, with refractile walls and a 1–1.5 μm broad
gelatinous sheath, smooth or inely striate, hyaline, yellow to pink en
masse, without germ pore, 6–7 × 3–4 μm. Conidiogenous apparatus
varying by species, featuring one or more of: conidiophores up to
125 μm long × 2–3.5 μm wide, septate, unbranched, with terminal
phialides 10–65 μm long, producing unicellular, hyaline, smoothwalled phialoconidia, obovate, oblong or cylindrical 4.4–7.4 μm; or
conidiophores up to 175 μm long, unbranched or uncommonly with
one or more branches, retrogressive, shortening with production
of each conidium, with each conidial base subsuming a portion of
conidiophore apex; conidia 0–1-septate, ellipsoidal or ovate, with a
decurved, abruptly narrowed basal hilum terminating in a distinct
truncate end, 5–12 × 3–6.5 μm; or conidiophores ranging from
unicellular conidiogenous cells to multicellular, multiply rebranched
apparati extending indeinitely to beyond 200 μm long; terminal
cells 9–37 μm long with a cylindrical basal part and a narrowing,
apically extending conidiogenous rachis sympodially proliferating
and producing oval to ellipsoidal to cylindrical or allantoid conidia
3.5–11 × 1.5–3.5 μm, with truncate bases. Chlamydospores absent
159
SuMMerbell et al.
or present, when present mostly in intercalary chains, hyaline,
smooth or inely warted, 5–8(–12) μm wide. Internal transcribed
spacer sequence generally with distinct CACAAACCTCGCG
motif in ITS2 region. The numerical position varies by species and
isolate, cf. position 476 in GenBank record EU445372, ITS for
Spicellum ovalisporum ex-type isolate DAOM 186447.
Various taxa described as Trichothecium need to be investigated
to determine their relationship to this phylogenetic genus. For
example, Trichothecium luteum and T. parvum, not represented by
living cultures, should be investigated, as should T. campaniforme and
T. plasmoparae, which are represented by one isolate each in CBS.
Trichothecium domesticum was recently redisposed as Fusarium
domesticum (Bachmann et al. 2005). Of teleomorphs reported to have
Trichothecium anamorphs, Heleococcum japonense is unrelated to
the Trichothecium clade (Fig. 2; the sequence is erroneously listed
as H. japonicum in GenBank); rather it is related to Gliomastix and
Hydropisphaera. A Trichothecium state of Hypomyces subiculosus
(syn. H. trichothecoides) was described, but Hypomyces, a member
of the Hypocreaceae, is a remote relative of the Trichothecium clade
within the Hypocreales (Fig. 2).
1. Type species. Trichothecium roseum (Pers.) Link, Mag.
Gesell. naturf. Freunde, Berlin 3: 18. 1809.
Synonymy is given in MycoBank record MB164181.
2. Trichothecium crotocinigenum (Schol-Schwarz)
Summerbell, Seifert, & Schroers, comb. nov. MycoBank
MB519596.
with ITS sequence record EU445372 for the ex-type isolate of S.
ovalisporum, DAOM 186447. Two more CBS isolates accessed
as S. roseum, CBS 119.77 and CBS 146.78, also gave ITS
sequences identical to EU445372. A recent partial ITS sequence
made by K.A. Seifert for CBS 227.76 agreed with our sequence
(data not shown). No one has thus been able to replicate the
sequence given for S. roseum in AB019365 and we are uncertain
of its signiicance, even though a similar sequence (GenBank
AB019364) has been attributed to two other S. roseum isolates
in the JCM collection by the same depositor, G. Okada. If the
fallibilities of earlier sequencing chemistries are involved in these
discrepancies, S. ovalisporum may be more closely related to T.
sympodiale than is evident in the literature. Preliminary results
have shown at least one substitution distinguishing the translation
elongation factor α sequence of S. ovalisporum from that of T.
sympodiale (Rehner, data not shown). Based on comparative
morphology and habitat, the authors of S. ovalisporum are
conident that their species is distinct, and thus the new
combination is included here with their sanction.
5. Trichothecium sympodiale Summerbell, Seifert, &
Schroers, nom. nov. MycoBank MB 519600.
Basionym: Spicellum roseum Nicot & Roquebert, Revue Mycol.,
Paris 39: 272. 1976 [1975].
If recombined into Trichothecium, Spicellum roseum would result in
a homonym of the type species, thus a new name is needed.
Basionym: Cephalosporium crotocinigenum Schol-Schwarz, Trans.
Brit. Mycol. Soc. 48: 53. 1965.
Acremonium atrogriseum and Acremonium cf.
alternatum CBs 109043 in the Cephalothecaceae: a
study in comparative morphology vs. phylogeny
As pointed out by Seifert et al. (2008, supplement), T. crotocinigenum
has long been known to produce crotocin mycotoxins that are similar
to the trichothecenes produced by T. roseum and T. sympodiale.
The production of similar mycotoxins reinforces the argument for
phylogenetic nomenclature such that scientiic names relect true
relationships.
Acremonium atrogriseum and an isolate identiied as Acremonium cf.
alternatum CBS 109043 belong in the Cephalothecaceae (Fig. 1C).
This isolate is a white coloured acremonioid fungus forming fusoid
conidia in long chains. It also forms small, dark structures that may
be aborted ascomatal initials. Sequencing of the ITS region (data not
shown) reveals it to be a representative of Phialemonium obovatum.
It is identical in all bases but one to the ITS sequence of ex-type strain
CBS 279.76 (AB278187) and in all but two bases to another isolate
of this species, CBS 116.74. Phialemonium obovatum was described
as having conidia in slimy heads (Gams & McGinnis 1983). CBS
109043 shows that either mucoid heads or chains may be formed
in this species, as in Acremonium persicinum, A. sclerotigenum,
and Gliomastix murorum. Gams (1971) mentions an isolate of
Sarocladium bacillisporum that tends to produce mucoid heads.
Colonies producing conidia in chains often have a different look from
their head-forming conspeciics; the mass colour of the chains may
give the colony colours not found in the species descriptions, such
as the chalk white colour of CBS 109043 in contrast to the normally
pale greenish brown of P. obovatum or the greenish grey of A.
sclerotigenum isolate 223.70, in contrast to the normal pale salmon
pink of non-catenate A. sclerotigenum.
Existing morphological keys and descriptions not just in
Acremonium but in all the acremonioid fungi need to be cautiously and
skeptically interpreted. At the very least, identiications for publication
should be tested by sequencing. We hope that the LSU sequences
in this paper will provide the foundation for a phylogenetically sound
approach to the systematics and ecology of acremonioid fungi.
≡ Acremonium
crotocinigenum
(Schol-Schwarz)
W.
Cephalosporium-artige Schimmelpilze (Stuttgart): 112. 1971.
Gams,
3. Trichothecium indicum (Arx, Mukerji & N. Singh)
Summerbell, Seifert, & Schroers, comb. nov. MycoBank
MB519597.
Basionym: Leucosphaerina indica (Arx, Mukerji & N. Singh) Arx,
Persoonia 13: 294. 1987.
With phylogenetic hindsight, the photographs of this species’
anamorph in the original description by von Arx et al. (1978) can
be seen to suggest Acremonium, Spicellum, and Trichothecium.
4. Trichothecium ovalisporum (Seifert & Rehner) Seifert &
Rehner, comb. nov. MycoBank MB519598.
Basionym: Spicellum ovalisporum Seifert & S.A. Rehner, Fungal
Planet: no. 28. 2008.
The relationship of the recently described Spicellum ovalisporum
to T. sympodiale is not clear. The ex-type of T. sympodiale
(CBS 227.76) was resequenced for the ITS region; the resulting
sequence differed from the GenBank record AB019365 by 7 gaps
and one C ↔ T transition. The sequence had 100 % identity
160
acremonium phylogeny
ACKNOWleDGeMeNTs
We greatly thank Arien van Iperen, Bert Gerrits-van den Ende, and Kasper
Luijsterburg for essential technical support in this study, as well as Keith Seifert
and Steve Rehner for scientiic contributions. Key work was done by co-op students
Salvatore Lopes, Saghal Ahmed-Suleyman, Arwin van der Rhee, and Nienke
Lancee as well as visiting Canadian student Jonathan Shapero. For sending type
cultures, we thank Akira Nakagiri of the NITE Biological Resource Centre Fungi
collection and Françoise Symoens of the BCCM-IHEM collection. The staff of the
CBS Collection deserve special thanks for strain cultivation and additional work.
The encouragement and mentorship of Walter Gams is highly appreciated, and we
hope our partial resolution of the dilemmas posed by phylogenetic systematics in
Acremonium will be recognised as complementary to his invaluable work.
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