Pleosporales - CBS - KNAW

Fungal Diversity
Generic description
Habitat marine, saprobic. Ascomata large, solitary or gregarious,
immersed, subglobose to pyriform, ostiolate, papillate,
periphysate, black, branching, carbonaceous. Hamathecium
of dense, long trabeculate pseudoparaphyses, embedded in
mucilage. Asci 8-spored, bitunicate, fissitunicate, cylindrical,
with apical apparatus. Ascospores uniseriate to partially
overlapping, fusoid, hyaline when young, becoming brown
to dark brown at maturity, multi-septate towards each end,
with a hyaline, globose refractive chamber or appendage at
each end, not constricted at the septum.
Anamorphs reported for genus: none.
Literature: Hyde and Borse 1986; Suetrong et al. 2009.
Type species
Biatriospora marina K.D. Hyde & Borse, Mycotaxon 26:
264 (1986). (Fig. 12)
Ascomata 650–860 μm high×350–510 μm diam., solitary
or gregarious, immersed, subglobose to pyriform, ostiolate,
papillate, periphysate, black, carbonaceous (Fig. 12.2a). Hamathecium
of dense, long trabeculate pseudoparaphyses, 1–
1.5 μm broad, branching, embedded in mucilage. Asci 175–
Fig. 12 1 Biatriospora marina
(from IMI 297768, holotype). a,
b Cylindrical asci. Note the
mucilage pseudoparaphyses in
(a) and the conspicuous ocular
chamber in (b). c, d Ascospores
with hyaline end chambers
(arrowed). Scale bars: a, b=
50 μm, c, d=20 μm. 2 Line
drawings of Biatriospora marina
(based on holotype). a Section
through ascocarp showing
asci and pseudoparaphyses. b
Asci and pseudoparaphyses. c
Ascospores. Scale bars: a=
200 μm, b=40 μm, c=30 μm
(figure with permission from
Hyde and Borse 1986)