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All Fungi
Cucurbitaria spartii
Nomenclature
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Family: CucurbitariaceaeGenus: Cucurbitaria
SUMMARY
Anamorph: Camarosporium cytisi Berl. & Bres. fide Müller & Baumeister (1957), Pyrenochaeta-like fide Mirza (1968).
Pyrenochaeta anamorph: Conidiomata 150-200 µm diam, ± globose, dark brown to black, strongly aggregated and closely associated with the ascomata; the wall composed of 2-3 layers of slightly flattened thick-walled dark brown cells intermediate between textura angularis and globulosa with cells to 16 µm diam. Conidiophores absent in the material studied. Conidiogenous cells 4-6 µm diam, ampulliform, proliferating percurrently. Conidia 4.5-6 x 1.5-2 µm, cylindrical to bacillar, hyaline, aseptate.
The Camarosporium anamorph has olivaceous conidia 22-26 x 9-12 µm in size, formed from conidiogenous cells 20-25 µm in length (Müller & Baumeister, 1957); no material has been seen. C. spartii was considered to be closely related to C. elongata by Welch (1926), but the reddish brown ascomata suggest a link with C. caraganae P. Karsten, described from Caragana in Finland.
Teleomorph: Stroma composed of a loose mat of reddish brown hyphae immersed within the epidermal layers. Ascomata 300-600 µm diam, formed in longitudinal rows and erumpent at first individually and then through cracks in the bark, globose to turbinate, often flattened at the apex, the ostiole at first appearing sunken but eventually minutely papillate; at first pinkish brown with a scurfy surface but becoming almost black and minutely verrucose. Peridium membanous, composed of a thick outer layer of mid brown fairly thick-walled tissue intermediate between textura angularis and globulosa with cells to ca 15 µm diam, merging into a hyaline inner layer with thick-walled glassy cells of similar size and shape. Periphyses present, to 30 x 3 µm, hyaline, thick-walled rather irregular in form. Pseudoparaphyses copious, 2.5-3 µm diam, clearly septate, rather thick-walled. Asci formed from a basal hyaline pad, 180-250 x 12-14 µm, the stalk variable in length, thick-walled and fissitunicate, the apex rounded to almost truncate with a clear invagination in the inner wall apex, usually 8-spored but with a proportion of asci containing 4 or 6 spores. Ascospores (21-) 23-29 x 9-11 µm, muriform, cylindric-ellipsoidal to fusiform-ellipsoidal, the apices acute to rounded, not bilaterally constricted, reddish brown, mucous sheath not seen, strongly constricted at the primary septum, usually with 6 transverse secondary septa and 1 longitudinal septum, irregularly arranged and often oblique, the longitudinal septum not extending from one apex to the other.