Nemania effusa

              

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JF02111

JF02111

JF02111

JF02111

JF02111

JF02111

JF02111

Nemania effusa (Nitschke) Pouzar.

Stromata superficial, effused-elongate, 10-30 mm long x 4-10 mm broad x 0.5-0.8 mm thick, weakly carbonaceous; surface dark brown to blackish brown, with very conspicuous perithecial mounds, when immature coated with a beige hyphal layer; interperithecial tissue whitish, soft; margin abrupt.

Perithecia subglobose, frequently flattened, 0.4-0.6 mm diam x 0.4-0.5 mm high.

Ostioles coarsely papillate, conical, black.

Asci cylindrical, long-stipitate, the spore-bearing parts 50-65 µm long x 5-7 µm broad, the stipes averaging 80 µm long, with apical apparatus amyloid, inverted hat -shaped, 2-2.5 µm high x 1.5-1.8 µm broad.

Ascospores 6-7.5 (-8) x 2.7-3 (-3.5) µm, pale brown, ellipsoid-inequilateral with broadly rounded ends, 1-2-seriate in the ascus, with a very inconspicuous short germ slit on the less convex side.

Specimen examined: FRANCE: Tarn (81): Sorèze, St. Jammes, 15 Jun. 2002, JF-02111, on decorticated wood of a dead standing trunk of Salix atrocinerea, in a willow bog. Found immature and kept in a damp place until its maturation in September 2002.

Notes: Nemania effusa differs primarily from other serpens-like members of Nemania in its short and narrow ascospores. Ascospores dimensions given by Granmo et al. (1999) are 6-9.5 x 3-4.5 µm, slightly larger than reported elsewhere (Dennis, 1974; Pouzar, 1985b; Petrini and Müller, 1986; Ju and Rogers, 2002). Its dark brown stromata with very conspicuous perithecial mounds and conical black ostioles also are fairly distinctive.

It is considered as rare in North America by Miller (1961), in central Europe by Pouzar (1985 b) and Petrini and Müller (1986), while Granmo et al. (1999) reported a fairly large number of collections from northern Europe (Denmark, Finland, Norway and Sweden), and Dennis (1974) recorded it from U. K. Most of these records are on Salix sp., but Granmo et al. (1999) reported N. effusa on other hosts (Betula, Populus and Quercus) and interestingly on Polypores ( Phellinus). Our collection is likely to be the first published one from France.