Biscogniauxia granmoi

              

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legGranmo

legGranmo

legGranmo

legGranmo

legGranmo

Biscogniauxia granmoi Lar. N. Vassiljeva

Stromata applanate, discoid, 7-10 mm diam x 2-2.5 mm thick, with slightly raised margins; surface blackish, carbonaceous; the tissue beneath the perithecia greyish, up to 1.5 mm thick, extending into the substrate, limited by a black carbonaceous layer.

Perithecia narrowly ovoid to tubular, 0.4-0.5 mm diam x 0.8 mm high.

Ostioles umbilicate, inconspicuous, in our specimen hidden under black ascospores masses.

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

Ascospores medium brown, ellipsoid slightly inequilateral with broadly rounded ends, 11.5-13.5 x 6-6.8 µm, with straight, conspicuous germ slit spore-length on the less convex side.

Specimen examined: AUSTRIA: Niderösterreich, Korneburg district, Rußbach, 500 m S of Dauersberg, 300 m alt, 7562/1, 01 May 1996, on Prunus padus, leg. A. Hausknecht.

Notes: The above description is based on material kindly sent to FC by Dr. A. Granmo. For a more comprehensive description, the reader is refered to Læssøe et al. (1999).

Biscogniauxia granmoi is morphologically similar to the widespread B. nummularia, from which it differs primarily in having umbilicate ostioles, tubular perithecia, paler and more slender ascospores, and in being restricted to Prunus padus in northern Europe. It is so far known from Austria, Latvia, Norway, Poland and Far Eastern Russia (Læssøe et al.,1999), and is not yet reported from France.