Pleosporales - CBS - KNAW

Fungal Diversity
Fig. 17 Byssosphaeria schiedermayriana (from K(M):108784,
holotype). a Superficial ascomata on the host surface. b Brown, 1-
septate ascospores. c Section of the lateral peridium. Note the outer
textura angularis and inner textura epidermoidea cells. d, e Furcate
asci with a long pedicel. f Dehiscent ascus. Scale bars: a=0.5 mm, c=
50 μm, b, d–f=15 μm
ostiole, ostiolar region sometimes with orange and
greenish tint, wall black, roughened, coriaceous
(Fig. 17a). Peridium 55–85 μm thick, peridium outside
of the substrate comprising two cell types, outer layer
composed of brown thick-walled cells of textura epidermoidea,
cells 1–3 μm diam., inner layer composed of
small hyaline cells, cells 3–5 μm diam., merging into
pseudoparaphyses; peridium inside the substrate one
layer, composed of large pale brown cells of textura
angularis, cells6–13 μm diam. (Fig. 17c). Hamathecium
of dense, long trabeculate pseudoparaphyses, 1–2 μm
broad, embedded in mucilage, anastomosing between and
above the asci. Asci 90–120(−148)×10–14 μm, 8-spored,
bitunicate, fissitunicate, cylindro-clavate to clavate,
biseriate above and uniseriate below, pedicel 15–20
(−53) μm long, the immature asci usually with longer
and furcate pedicel (−68 μm) (Fig. 17d,e and f).
Ascospores 29–34(−38)×5.5–8(−10) μm, fusoid with
narrow ends, mostly straight, sometimes slightly curved,
smooth, pale brown, 1-septate, becoming 3-septate after
discharge, with hyaline appendages at each acute to
subacute end; in some mature spores the appendage may
be absent (Fig. 17b).
Anamorph: Pyrenochaeta sp. (Barr 1984; Samuels and
Müller 1978).
Pycnidia 70–500 μm diam. Conidiogenous cells phialidic,
lining cavity, 5–8×4–6 μm to 5–10×3–6 μm. Conidia
2.5–3.5(−4)×1.5–2(−3) μm, hyaline, ellipsoid or subglobose
(Barr 1984).
Material examined: ERIE, Dublin, Glasnevin Botanic
Garden, on old rope, Jun. 1872, W. Keit (K(M):108784,
holotype, asSphaeria keitii Berk. & Broome).