Biscogniauxia anceps (Sacc.) J. D. Rogers, Y.-M. Ju, & Cand.
TELEOMORPH | CULTURES AND ANAMORPH | SPECIMENS EXAMINED | NOTES
Biscogniauxia anceps (Sacc.) J. D. Rogers, Y.-M. Ju, & Cand., Mycol. Res. 100: 669. 1996.
º Nummularia anceps Sacc., Bull. Orto Bot. Univers. Napoli 24: 28. 1918.
Stromata applanate, discoid to widespreading, up to 1 mm thick, with distinct margins, often cracked in a manner reminiscent of Diatrype stigma. Exterior dull black with sunken grey ostiolar sites, giving the whole a greyish cast; interior dull black. Outermost stromatal layer carbonaceous; interior woody.
Perithecia 0.2-0.4 mm diam.
Ostioles umbilicate, located in grey depressed areas.
Asci eight-spored, short-stipitate, 110-140 Ám total length x 8-11 Ám broad, the spore-bearing part 103-118 Ám long, the stipe 7-30 Ám long; ascus apical ring blueing in Melzer's reagent, plate-like to almost cuboid, 3-3.5 Ám broad x 1.5-3 Ám high.
Ascospores unequally two-celled, the larger cell sometimes dark brown to almost black and the smaller cell hyaline to subhyaline but most commonly both cells remaining hyaline, smooth, approximately ellipsoid to ellipsoid-inequilateral to obovate. Ascospores (13-)14-18(-19) Ám total length x 7-9(-10) Ám broad at the broadest part, the larger cell 10-13 Ám long and the smaller cell 5-7 Ám long x 4-7 Ám broad. Larger cell when darkened with a straight full-length germ slit. Larger cell when hyaline and smaller cell devoid of germ slit. Paraphyses broad, longer than asci, septate, sparingly branched, numerous.