Biscogniauxia nummularia

              

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JF00114

JF00114

JF02241

JF99047

JF02241

JF99047

JF99047

JF99047

Biscogniauxia nummularia (Bull: Fr.) Kuntze.

Stromata applanate, discoid 5-20 mm diam to irregularly ellipsoid 15-50(-120) mm long x 10-22(-60) mm broad x 0.6-0.8 mm thick; surface black, carbonaceous, when young covered by a dehiscing light brown outer layer; tissue beneath perithecia inconspicuous.

Perithecia subglobose to obovoid, 0.4-0.6 mm diam x 0.5-0.7 mm high.

Ostioles discoid, slightly papillate to nearly at the same level as the stromatal surface.

Asci short-stipitate, with a discoid amyloid apical ring.

Ascospores dark brown to blackish, ellipsoid, frequently with narrowly rounded ends, 11.5 x 13.5 m, with straight, inconspicuous germ slit spore-length.

Specimens examined: FRANCE, Arige (09): Camarade, Les Moulis, 13 Dec. 2002, JF-02241, on Fagus sylvatica; Montseron, Ousset, 23 Feb. 1995, JF-95010, on Fagus sylvatica; Rimont, Grand Bois, 22 Mar. 1999, JF-99047, on Fagus sylvatica; Salau, Mines d'Anglade, 09 Jul. 2000, JF-00114, on Fagus sylvatica.

Notes: Biscogniauxia nummularia is distinctive among other members of Biscogniauxia with applanate stromata in the combination of black stromatal surface with slightly papillate ostioles, blackish brown ellipsoid ascospores 10-13 x 7.5-8.5 m and specificity for Fagus. The closest taxon is B. granmoi, thoroughly described by Lsse et al. (1999). They pointed out the main differences between these two species: in B. granmoi, ostioles are pitted and not papillate, stromatal margin is slightly raised, ascospores are medium brown, narrower (x 5-6.5 m) and all records were made on Prunus padus (in Europe) and Prunus padus var. pubescens (in Far Eastern Russia).

Biscogniauxia nummularia, the type species of the genus Biscogniauxia, is a common fungus specific for Fagus, recorded from all parts of Europe and Russia, following the distribution of its host.