Pleosporales - CBS - KNAW

Fungal Diversity
composed of one cell type of pale brown to hyaline
pseudoparenchymatous cells, becoming thicker near the apex
(Fig. 84a). Hamathecium of 1–2 μm broad, filliform, hyaline,
septate pseudoparaphyses, branching and anastomosing in
mucilage. Asci (90-)125–150×(20-)25–30 μm, 8-spored, with
a short pedicel, bitunicate, cylindro-clavate to clavate, with a
small ocular chamber at the apex (Fig. 84c). Ascospores 29–
42×8–11 μm, biseriate and sometimes laterally uniseriate,
fusoid with narrowly rounded ends, (2-)3-septate, deeply
constricted at the septa, the upper second cell subhyaline to
pale brown when young and becoming dark brown to almost
black at maturity, smooth or verruculose (Fig. 84d). (data from
the original description by Kaiser et al. (1979) because of the
bad condition of the type material).
Fig. 83 Roussoëlla nitidula
(from PAD Paol. 2484, holotype).
a Appearance of the
stroma on host surface. b Asci
and pseudoparaphyses. c, d
Long cylindrical furcate asci.
e–h. Ascospores. Note the striate
ornamentation. Scale bars:
a=0.5 mm, b–d=20 μm,
e–h=10 μm