Pleosporales - CBS - KNAW

Fungal Diversity
Fig. 26 Delitschia didyma
(from L, 1950). a Ascomata on
the substrate surface. Note the
ostiolar opening. b Section of
peridium. Note the small cells of
textura angularis. c Released
and unreleased ascospores. Note
the germ slit in each cell. d, e
Asci with ascospores and short
pedicels with rounded ends.
Scale bars: a=0.5 mm,
b =30 μm, c–e=70 μm
Type species
Didymosphaeria futilis (Berk. & Broome) Rehm, Hedwigia
18: 167 (1879). (Fig. 27)
≡ Sphaeria futilis Berk. & Broome, Ann. Mag. nat.
Hist., Ser. 2 9: 326 (1852).
Ascomata 190–230 μm high×240–340 μm diam., scattered,
or in small groups, immersed to slightly erumpent,
subglobose to ovoid, membraneous, near-hyaline, under
clypeus, papillate, periphysate (Fig. 27a and c). Papilla
central, up to 100 μm high, black, with a pore-like ostiole
(Fig. 27a and c). Peridium 30–40 μm wide upper part, 6–
23 μm wide near the base, 1-layered, composed of brown
pseudoparenchymatous cells of textura angularis, cell wall 2–
3 μm thick (Fig. 27b). Hamathecium of dense, long
trabeculate pseudoparaphyses, 0.8–1.5 μm broad, anastomosing
mostly above the asci, embedded in mucilage (Fig. 27d).
Asci 90–110×7.5–10 μm (x ¼ 97 9mm, n=10), 2–4-spored,
rarely 8-spored, bitunicate, fissitunicate, cylindrical, with a
furcate pedicel, 17.5–27.5 μm long, with a large ocular (to
2.5 μm wide×4 μm high) (Fig. 27d, e and f). Ascospores 14–
15.5×(5.5-) 6–7.5 μm (x ¼ 14:8 6:9mm, n=10), uniseriate,
ellipsoid with obtuse ends, brown, 1-septate, distoseptate,
slightly to not constricted, capitate (Fig. 27g).
Anamorph: Dendrophoma sp., Fusicladiella sp. vel aff.
(Sivanesan 1984).