Nemania illita (Schwein.) Pouzar.
Nemania illita is a rarely reported fungus known from China, Europe
and North America (Miller, 1961; Petrini and Müller, 1986) on various hosts
including Castanea, Fraxinus and Salix (Miller, 1961) that we
did not yet collect in southwestern France.
It is macroscopically characterized by widely effused stromata and conspicuous
conical ostioles, and is primarily distinguished from other Nemania taxa
in having yellowish to pale brown narrowly ellipsoid ascospores, 10-12 x 3-3.5
µm according to Miller (1961), 12-14 x 3-4 µm according to Petrini and Müller
(1986). Moreover, ascospores are reported as crescent-shaped by Ju and Rogers
(2002) and are said by Miller (1961) to have truncate ends, and ascospore
germ slit is reported on the more convex side by Petrini and Müller
(1986), while it is reported on the less convex side by Ju and Rogers
(2002). Pouzar (1985b) emphasized
the absence of De Bary gas bubbles in ascospores as very distinctive.