Pleosporales - CBS - KNAW

Fungal Diversity
Fig. 62 Moristroma polysporum
(from BAFC 32036, holotype).
a Two multiculate
ascostroma on the host surface.
b Section of an ascostroma.
Note the multilocula. c Section
of the peridium. Note the thick
walled cells. d, e Broadly cylindrical
to fusoid asci containing
numerous part spores. f Released
part spores. Scale bars:
a=0.5 mm, b=200 μm, c=
50 μm, d–f=10 μm
Morosphaeria Suetrong, Sakay., E.B.G. Jones & C.L.
Schoch, Stud. Mycol. 64: 161 (2009). (Morosphaeriaceae)
Generic description
Habitat marine, saprobic. Ascomata large, solitary or
gregarious, immersed to erumpent, subglobose or depressed
with a flatted base, ostiolate, papillate, brown to black,
coriaceous. Peridium thick. Hamathecium of dense, long
cellular pseudoparaphyses, septate. Asci 8-spored, bitunicate,
cylindrical, with short pedicels. Ascospores uniseriate
to partially overlapping, ellipsoidal, hyaline, 1-3-septate,
constricted at the septa, central cells larger, apical cells if
present small and elongated, surrounded with mucilaginous
sheath.
Anamorphs reported for genus: none.
Literature: Hyde and Borse 1986; Hyde 1991a, b;
Suetrong et al. 2009; Zhang et al. 2009a.
Type species
Morosphaeria velataspora (K.D. Hyde & Borse) Suetrong,
Sakay., E.B.G. Jones & C.L. Schoch, Stud. Mycol. 64: 161
(2009). (Fig. 63)
≡ Massarina velataspora K.D. Hyde & Borse, Mycotaxon
27: 163 (1986).
Ascomata 0.7–1.2 mm diam., solitary or gregarious,
immersed to erumpent, subglobose or depressed, with a
flattened base not easily removed from the substrate, ostiolate,
epapillate or papillate, brown to black, coriaceous (Fig. 63a).
Peridium thick, the upper part of the peridium composed of
brown thick-walled cells of textura angularis, cells are
smaller and wall thicker near the apex, at the rim is
composed of vertical, parallel, brown, elongate cells,
wedge-shape in section (Fig. 63a). Hamathecium of dense,
long cellular pseudoparaphyses, 1.1–1.7 μm broad, septate.
Asci 220–320×23–34 μm (x ¼ 251 28:2mm, n=10), 8-