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Nemania sp. Leroy-820725-01
Stromata erumpent, half-immersed to nearly superficial, weakly effused
to linear, rarely uniperitheciate at margin, 2-10 mm long x 1-3 mm broad x
0.5-0.6 mm thick, weakly carbonaceous; surface dark brown to blackish brown,
with conspicuous to inconspicuous perithecial mounds, coated with a loose yellowish
to beige hyphal layer; interperithecial and basal tissue absent; margin abrupt.
Perithecia obovoid, 0.4-0.5 mm diam x 0.5-0.6 mm high.
Ostioles
coarsely to obtusely papillate, black.
Asci cylindrical, short-stipitate, the spore-bearing parts 80-100
µm long x 7-8 µm broad, the stipes 20-40 µm long, with apical apparatus strongly
amyloid, inverted hat-shaped, 2.7-3.5 µm high x 2-2.7 µm broad.
Ascospores
12-15.5 x 5.5-6.5 (-7) µm, pale brown, ellipsoid-inequilateral with broadly
rounded ends, uniseriate in the ascus, with a fairly conspicuous short germ
slit 4-5 µm long on the more convex side.
Specimen examined: FRANCE: Indre et Loire (37): Cravant,
bois communaux, 25 Jul. 1982, Paul Leroy-820725-01, on Quercus.
Notes: This fungus is macroscopically very inconspicuous
and easily overlooked, but a careful examination shows that its stomata
are partially immersed and bear a distinctive yellowish hyphal layer which remains
on mature stromata, unlike in other Nemania taxa in which mature stromata
are usually naked. Microscopically, it is distinctive in having the combination
of short-stipitate asci with a strongly amyloid apical apparatus and ascospores
with a fairly conspicuous germ slit located on the more convex side. This combination
of characters does not fit any known Nemania species. Unfortunately this fungus
is known from only one collection and the wood it comes from has been replaced
by a Pinus plantation (Leroy, pers. comm.).
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