Pleosporales - CBS - KNAW

Fungal Diversity
Fig. 42 Keissleriella sambucina (from FH, holotype of Otthiella
aesculi). a Section of an ascoma. b Pseudoparaphyses which are
narrow (less than 1.5 μm) and branch and anastomosing as
trabeculate. c, d Hyaline ascospores with distinct constrictions at the
septa. e Asci amongst narrow pseudoparaphyses. F. Ascus with a
pedicel and ocular chamber. Scale bars: a=100 μm, b–f=10 μm
thick at apex, of small very thick-walled cells. Hamathecium
of cellular pseudoparaphyses, 2–2.5 μm broad (Fig. 43c and
d). Asci 89–100×19–21 μm, 8-spored, bitunicate, fissitunicate,
clavate, bumpy, short-stipitate, apex without obvious
apical chamber (Fig. 43e). Ascospores 27–35×8.5–9.4 μm,, 2-
3-seriate, broadly fusoid with broadly rounded ends, straight to
slightly curved, 1-septate, slightly constricted, with four large
guttules, hyaline, smooth-walled, a very thin mucilaginous
sheath can be occasionally observed in India ink but in most
cases no sheath can be observed (Fig. 43f and g).