Pleosporales - CBS - KNAW

Fungal Diversity
Fig. 57 Mauritiana rhizophorae
(from HKU(M)10219,
holotype). a Vertical section of
an ascoma. Note the thin layer of
fungal tissue (pseudostroma?) on
the host surface. b Section of a
partial peridium. c Pseudoparaphyses
and immature ascus. d
Fissitunicate asci. e Asci showing
thickening of the apical wall.
f–i Ascospores with transverse
septa and paler polar cells. Scale
bars: a=40 μm, b, d–i=10 μm,
c=20 μm
Anamorphs reported for genus: Aposphaeria, Nigrolentilocus,
Phoma-like and Pseudospiropes (Chesters 1938;
Sivanesan 1984).
Literature: Barr 1990a; Chesters 1938; Fuckel 1870;
Saccardo 1878; Zhang et al. 2008a.
Type species
Melanomma pulvis-pyrius (Pers.) Fuckel, Jb. nassau. Ver.
Naturk. 23–24: 160 (1870). (Fig. 58)
≡ Sphaeria pulvis-pyrius Pers., Syn. meth. fung.
(Göttingen) 1: 86 (1801).
Ascomata 215–471 μm high×260–440 μm diam.,
gregarious, substrate surface covered with a thin layer of
brown psueodstroma, superficial, globose, subglobose,
broadly or narrowly conical, often laterally flattened, black,
roughened and irregular, often bearing remnants of wood
fibers; apex short papillate, often somewhat puckered or
sulcate (Fig. 58a). Peridium 70–90 μm wide, to 180 μm
wide at the base, coriaceous, comprising two types of cells,
outer cells small heavily pigmented thick-walled cells of
textura angularis, apical cells smaller and walls thicker,
individual cell walls to 6 μm thick, inner cells lightly
pigmented to hyaline thin-walled cells of textura angularis,