Verlag Ferdinand Berger & Söhne Ges.m.b.H., Horn, Austria, download unter www.biologiezentrum.
Phytoparasitic Hyphomycetes from Utah (USA) - II
Uwe Braun1 & Clark T. Rogerson2
'Martin-Luther-Universität, FB. Biologie, Institut für Geobotanik und Botanischer
Garten, Neuwerk 21, D-06099 Halle/S., Germany
-The New York Botanical Garden, Bronx, New York, 10458-5126 USA
Braun, U. & C. T. Rogerson (1995). Phytoparasitic Hyphomycetes from Utah
(USA) - II. - Sydowia 47 (2): 141-145.
Cladosporium agoseridis sp. nov. is described and the new combination
Passalora platyspora is introduced. Some species new to North America and new
hosts are recorded.
Keywords: Hyphomycetes, USA, Utah, new records, Cladosporium agoseridis,
Passalora platyspora.
During various excursions in Utah, USA, the senior author
collected numerous phytopathogenic hyphomycetes. A Cladosporium
on Agoseris glauca turned out to be a new species. It is described as
Cladosporium agoseridis. Furthermore, the following new host plants
and fungal species new to North America are recorded: Thermopsis
montana [new host plant of Cercostigmina thermopsidis (Earle)
U. Braun], Cladosporium aecidiicola Thüm. (new to North America),
Perideridia gairdneri [new host for Passalora punctum (Delacr.)
S. Petzoldt], Ramularia lycopi Hollös on Lycopus asper (new to North
America, new host). The new combination Passalora platyspora (Ell.
& Holway) U. Braun is introduced. The present part continues the
paper published by Braun & Rogerson (1993).
Cercostigmina thermopsidis (Earle) U. Braun, Crypt. Bot. 4: 108 (1993).
= Cercospora thermopsidis Earle, Bull. New York bot. Gard. 2: 348 (1902).
= Stigmina earlei Deighton, Mycol. Pap. 151: 8 (1983).
M a t e r i a l e x a m i n e d . - USA: Utah, San Juan Co., Manti-La Sal
National Forest, west of Monticello, on Thermopsis montana Nutt., Aug. 28, 1988,
C. T. Rogerson 88-123 (NY, HAL). Washington Co., Dixie National Forest, north
side of Pine Valley Mountains, Whipple Creek Trailhead, Aug. 22, 1991, C. T.
Rogerson 91-66 (NY, HAL).
This is the first record of C. thermopsidis from Utah and
Thermopsis montana is a new host species (cf. Farr & al., 1989). There
141
Verlag Ferdinand Berger & Söhne Ges.m.b.H., Horn, Austria, download unter www.biologiezentrum.
is a third collection on this host from Arizona [Cochise Co., Coronado
National Forest, Rustler Park Campground, west of Portal, Aug. 22,
1994, C. T. Rogerson 94-50 (NY, HAL)].
Cladosporium aecidiicola Thüm., Mycotheca universalis 173 (1876).
M a t e r i a l e x a m i n e d , - USA: Utah, Wasatch Co., Uinta National Forest,
Soldier Creek Bay, near Aspen Grove Recreation Site, on aecia of Puccinia
grindeliae Peck on leaves of Chrysothamnus viscidiflorus var. lanceolatus (Nutt.)
Greene [det. (host plant): N. H. Holmgren], Sept. 8, 1994, C. T. Rogerson 94-51 (NY,
HAL).
According to Ellis (1976), this species was only known from
Europe. The host is new.
Cladosporium agoseridis U. Braun & Rogerson sp. nov. - Fig. 1.
Maculae amphigenae, suborbiculares vel irreguläres, 1-8 mm diam. vel
confluentes, griseo-brunneae, saepe zonatae, margine tenui atriore brunneo cinctae.
Caespituli amphigeni, punctiformes vel subeffusi, brunnei. Mycelium immersum.
Hyphae brunneae, septatae, ramosae, ca. 3-10 |j.m latae, interdum aggregatae,
inflatae, ca. 5-15 |j.m latae, subcuticulares vel intraepidermales. Conidiophora
solitaria vel laxe subfasciculata, erumpentia, simplicia, 20-60 x 3-10 i^m, erecta,
subcylindrica vel curvata, geniculata-sinuosa, saepe apicem versus attenuata,
pallide flavida, olivacea vel brunnea, modice crassitunicata, levia. Cicatrices
conidiales conspicuae, prominentes, incrassatae, fuscae. Conidia catenata vel
ramicatenata, subglobosa, ellipsoidea-ovoidea, subcylindrica, (10-)12-30(-50) x
(5-)6-13(-15) |j.m, 0-l(-3) septata, pallide flavida, olivacea vel brunnea, dense
verrucosa, modice crassitunicata; hila prominentia, incrassata, fusca.
H o l o t y p u s . - USA: Utah, Washington Co., northwest side of Pine Valley
Mountain, northeast of Diamond Valley, vicinity of Mud Spring, on Agoseris glauca
(Pursh) Raf. (Asteraceae), June 7, 1994, C. T. Rogerson 94-49 (NY). Isotypus: HAL.
L e a f s p o t s amphigenous, subcircular or somewhat irregular,
1-8 mm diam. or confluent and larger, greyish brown, often somewhat
zonate, surrounded by a narrow darker margin or marginal line,
finally large leaf segments or entire leaves discoloured, brown,
necrotic. - C a e s p i t u l i amphigenous, punctiform to subeffuse,
brown. - M y c e l i u m internal; hyphae brown, septate, branched, ca.
3-10 |xm wide, forming small subcuticular to intraepidermal
aggregations of inflated hyphal cells, ca. 5-15 \x.m wide, brown. C o n i d i o p h o r e s solitary or in small loose groups or fascicles,
arising from internal hyphae or hyphal aggregations, erumpent,
simple, 20-60 x 3-10 (xm, straight and subcylindric to curved,
geniculate-sinuous, often wider near the base and attenuated towards
the apex, pale yellowish, olivaceous to brown, wall somewhat
thickened, smooth; conidial scars conspicuous, prominent, thickened
142
Verlag Ferdinand Berger & Söhne Ges.m.b.H., Horn, Austria, download unter www.biologiezentrum.a
Fig. 1. - Cladosporium agoseridis sp. nov. - a. lesions. - b. conidia. - c. conidiophores. d. hyphae.
Fig. 2. - Passalora punctum on Perideridia gairdneri. - a. conidia. - b. conidiophores.- c. fascicle of conidiophores. - B a r = 20 ^m. U. Braun del.
143
Verlag Ferdinand Berger & Söhne Ges.m.b.H., Horn, Austria, download unter www.biologiezentrum.
and darkened (Cladosporium type). - C o n i d i a catenate, often
in branched chains, subglobose, ellipsoid-ovoid, subcylindric,
(10-)12-30(-50) x (5-)6-13(-15) (xm, 0-l(-3)-septate, pale yellowish,
olivaceous to brown, wall densely verrucose, somewhat thickened;
hila prominent, thickened and darkened (Cladosporium type).
C. agoseridis is biologically distinct from C. herbarum (Pers.)
Link, C. macrocarpum Preuss, C. cladosporioides (Fres.) de Vries and
other saprobic species. The new species is phytopathogenic and causes
definite leaf spots. C. herbarum and C. macrocarpum are
morphologically distinguished by much longer nodulose
conidiophores and much narrower conidia, mostly 2-5 |jim wide. The
conidiophores of C. variabilis (Cooke) de Vries are similar, but the
conidiophores are much longer, often nodulose and tortuous, and
spirally coiled aerial hyphae are present. C. obtectum Rabenh. (on
Artemisia, Asteraceae, Sardinia) and C. gynoxidicola Petr. (on
Gynoxys, Asteraceae, Ecuador) are distinguished by having
frequently branched conidiophores. The latter species is rather
Mycovellosiella-like (Ellis, 1971, 1976). Shaw (1973) recorded
Cladosporium spec, on Agoseris glauca from Washington. This record
seems to belong to the present species.
Passalora punctum (Delacr.) S. Petzoldt, in Arx, Plant Pathogenic
Fungi: 288, Berlin, Stuttgart 1987 (sub „puncta"). - Fig. 2.
= Cercosporidium punctum (Delacr.) Deighton, Mycol. Pap. 112: 47 (1967).
Material
e x a m i n e d . - USA: Utah, Weber Co., Wasatch Mts.,
Coldwater Canyon, east of Ogden, on Perideridia gairdneri (Hook. & Arnott)
Mathias (Apiaceae), Aug. 14, 1990, C. T. Rogerson 90-94 (NY, HAL).
This collection is characterized as follows:
C o n i d i o m a t a punctiform, large, sporodochial; stromata
substomatal, large, 30-100 |o,m diam. - C o n i d i o p h o r e s very
numerous, in dense fascicles, usually curved, 8-40 x 3-9 (im,
continuous or with a single basal septum, olivaceous brown, partly
geniculate. - C o n i d i a subcylindric (-obclavate), 25-45 x (4-)57(-9) |xm, hyaline or subhyaline, smooth.
Perideridia gairdneri has been recorded from North America as
host of Cercosporidium depressum (Berk. & Br.) Deighton (= Passalora
depressa (Berk. & Br.) Sacc.) and Cercosporidium punctiforme
(G. Winter) Deighton (Farr & al., 1989). The latter species differs,
however, by having distinctly septate conidiophores and verruculose
conidia (distinctly verruculose in the lower half). Passalora depressa
144
Verlag Ferdinand Berger & Söhne Ges.m.b.H., Horn, Austria, download unter www.biologiezentrum.
is characterized by non-geniculate eonidiophores and faintly
pigmented conidia.
The genus Cercosporidium has been reduced to synonymy with
Passalora (Arx, 1983; Deighton, 1990; Braun, 1995). Passalora platyspora
is the correct name for Cercosporidium punctiforme in this genus:
Passalora platyspora (Ell. & Holway) U. Braun comb. nov.
Bas.: Cercospora platyspora Ell. & Holway, J. Mycol. 3: 16 (1887).
= Didymaria platyspora (Ell. & Holway) Ell. & Ev., North American Fungi,
Second Ser., 2873 (1893).
= Fusicladium depressum var. platysporum (Ell. & Holway) J. J. Davis,
Parasitic fungi ofWisconsin: 113 (1942).
= Fusicladium punctiforme G. Winter, in Rabenh., Fungi europaei et
extraeuropaei 3582 (1886), non Passalora punctiformis Otth, Mitt, naturf.
Ges. Bern: 66 (1868).
= Cercosporidium punctiforme (G. Winter) Deighton, Mycol. Pap. 112: 45
(1967).
= Passalora winteriana U. Braun, Nova Hedwigia 55: 214 (1992).
Ramularia lycopi Hollös, Annls Mus. nat. Hung. 5: 467 (1907).
M a t e r i a l e x a m i n e d . - USA: Utah, Weber Co., North Fork County Park,
along Cutler Creek, east side of Wasatch Mts., northwest of Liberty, on Lycopus asper
Greene (Lamiaceae), Aug. 16, 1989, C. T. Rogerson 89-108 (NY, HAL).
This species is new to North America and the host plant is also new.
References
Arx, J. A. von (1983). Mycosphaerella and its anamorphs. - Proc. k. Nederl. Akad.
Wet., C, 86: 15-54.
Braun, U. (1995). A monograph of Cercosporella, Ramularia and allied genera
(phytopathogenic hyphomycetes). Vol. 1. -IHW Verlag, Eching.
Braun, U. & C. T. Rogerson (1993). Phytoparasitic Hyphomycetes from Utah
(USA). - Mycotaxon 46: 269-274.
Deighton, F. C. (1990). Observations on Phaeoisariopsis. - Mycol. Res. 94:
1096-1102.
Ellis, M. B. (1971). Dematiaceous Hyphomycetes. - IMI, Kew. 608 pp.
(1976). More Dematiaceous Hyphomycetes. - IMI, Kew. 507 pp.
Farr, D. F., G. B. Bills, P. G. Chamuris & A. Y. Rossman (1989). Fungi on Plants and
Plant Products in the United States. - APS Press, St. Paul. 1252 pp.
Shaw, C. G. (1973). Host fungus index for the Pacific Northwest - I. Hosts. - Wash.
State Agric. Exp. Stat. Bull. 765: 1-121.
(Manuscript accepted 20th June 1995)
145