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Nemania sp. Leroy PL-971115-01
Stromata superficial, effused, ellipsoid to elongate, 3-20 mm long
x 2-5 mm broad x 0.6-0.8 mm thick, weakly carbonaceous; surface brown to
blackish, with inconspicuous perithecial mounds, when immature coated with a brown
to pale brown hyphal layer; interperithecial tissue whitish, persistant; basal
tissue whitish, up to 0.25 mm thick; margin abrupt.
Perithecia subglobose,
0.4-0.5 mm diam x 0.5 mm high.
Ostioles minutely papillate, obtuse, black.
Asci cylindrical, long-stipitate, the spore-bearing parts 50-70 µm
long x 6-8 µm broad, the stipes 60-80 µm long, with apical apparatus amyloid,
inverted hat-shaped to cuboid, 2-2.7 µm high x 2-2.5 µm broad.
Ascospores
10.5-13.5 x 4.8-5.5 µm, medium brown, ellipsoid-inequilateral with frequently
narrowly rounded ends, 1-2-seriate in the ascus, with a fairly conspicuous short
germ slit 3.5-6 µm long on the less convex side.
Specimen examined: FRANCE: Indre et Loire (37): Marcé
sur Esvres, La Louère, 15 Nov. 1997, Paul Leroy 971115-01, on Carpinus betulus.
Notes: this Nemania is much like N. serpens var.
colliculosa in having weakly carbonaceous stromata with inconspicuous perithecial
mounds, perithecia not exceeding 0.5 mm in diameter and ascospores with a similar
size range and a germ slit on the less convex side. It differs primarily in
that ascospores are darker with more narrowly rounded ends, and have a
fairly conspicuous germ slit.
In fact it agrees well with the description of N. serpens
var. hydnicola [as N. reticulata (P. Karst.) Granmo] given by
Granmo et al. (1999) except it is lignicolous instead of fungicolous.
Although Ju and Rogers (2002) give a woody substrate for one collection from
U. S. A., host preference of N. serpens var. hydnicola for Polypores
and Hydnum seems to be a highly distinctive feature. For this reason we
refrain to identify PL-971115-01 as N. serpens var. hydnicola
until the host- specificity for Polypores of the latter is confirmed or invalidated
by additional observations.
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