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Nemania sp. leg. J. Vivant
Stroma superficial, orbicular, 8 mm long x 6 mm broad x 0.7-1 mm thick, weakly carbonaceous,
with abrupt margin; surface blackish grey, with inconspicuous
perithecial mounds; interperithecial tissue greyish brown, the
tissue beneath the perithecial layer whitish, soft, extending into the wood.
Perithecia subglobose, 0.5-0.6 mm diam.
Ostioles opening at the same
level as the stromatal surface to minutely papillate, black.
Asci cylindrical, long-stipitate, the spore-bearing parts 60-70 µm
long, the stipes averaging 70 µm long, with apical apparatus urn-shaped, strongly amyloid,
4-5 µm high x 3.5 µm broad.
Ascospores 12-13.5 (-15) x 4.8-5.5 µm, ellipsoid-inequilateral
with broadly rounded ends, pale to medium brown, 2-3-seriate in the ascus, with
a short, inconpicuous germ slit on the more convex side.
Specimen examined: FRANCE: Landes (40), Vallée de l'Adour, Vicq d'Auribat,
Barthes, 11 Aug. 2001, JF-01191, leg. Jean Vivant, on rotten trunk of Populus.
Notes: this specimen macroscopically resembles Nemania aenea
var. macrospora in its blackish grey weakly carbonaceous stroma with a conspicuous layer
of whitish tissue beneath the perithecial layer. It differs in having smaller
perithecia, less prominent ostioles, asci with a larger urn-shaped apical apparatus
and smaller ascospores with a narrow germ slit on the more convex side. Ascospore
size ranges slightly overlap, but the situation of the germ slit seems distinctive.
This might be a new taxon, which needs additional collections in order to appreciate
its probable variations and needs to be cultured in order to be compared to
similar taxa, especially N. aenea var. macrospora.
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