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Pleosporales - CBS - KNAW

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Fungal Diversity<br />

1980) has scolecospores without swollen central cells or<br />

breaking into partspores.The recent introduction of Ophiobolus<br />

shoemakeri Raja & Shearer (Raja and Shearer 2008)<br />

is probably incorrect since the ascospores do not split up<br />

into partspores and there is no swelling above septum<br />

either. In particular, its freshwater habitat also distinguishes<br />

it from other species of Ophiobolus. Like<br />

Ophiobolus, Ophiosphaerella is in need of phylogenetic<br />

analysis but appears to be closely related to Phaeosphaeriaceae<br />

(Schoch et al. 2006).<br />

Ostropella (Sacc.) Höhn., Annls mycol. 16: 144 (1918).<br />

(<strong>Pleosporales</strong>, genera incertae sedis)<br />

≡ Ostropa subgen. Ostropella Sacc., Syll. fung. (Abellini)<br />

2: 805 (1883).<br />

Generic description<br />

Habitat terrestrial, saprobic. Ascomata large, erumpent<br />

to superficial, solitary or gregarious, globose to subglobose,<br />

with broad and compressed papilla and slit-like<br />

ostiole. Peridium carbonaceous. Hamathecium of dense,<br />

long trabeculate pseudoparaphyses, anastomosing and<br />

branching, rarely septate, embedded in mucilage. Asci<br />

clavate with very long and thin and furcate pedicels.<br />

Ascospores pale brown, ellipsoid to fusoid, 1-septate,<br />

constricted.<br />

Anamorphs reported for genus: none.<br />

Literature: Barr 1990a; Chesters and Bell 1970; Holm and<br />

Yue 1987; Huhndorf 1993; Müller and von Arx 1962;<br />

Müller and Dennis 1965; Saccardo 1883.<br />

Fig. 71 Ophiosphaerella<br />

graminicola (from LPS 858,<br />

holotype). a Ascomata on the<br />

host surface. Note the protruding<br />

disk-like papilla. b Section<br />

of an ascoma. c Asci in<br />

pseudoparaphyses with short<br />

pedicels. d–f Cylindrical asci<br />

with short pedicels. Scale bars:<br />

a=0.5 mm,<br />

b=100 μm, c–f =10 μm

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