Nemania sp. PL-971115-01

              

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PL971115-01

PL971115-01

PL971115-01

PL971115-01

PL971115-01

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 Ám long x 6-8 Ám broad, the stipes 60-80 Ám long, with apical apparatus amyloid, inverted hat-shaped to cuboid, 2-2.7 Ám high x 2-2.5 Ám broad.

Ascospores 10.5-13.5 x 4.8-5.5 Ám, 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 Ám long on the less convex side.

Specimen examined: FRANCE: Indre et Loire (37): MarcÚ sur Esvres, La LouŔre, 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.