Biscogniauxia schweinitzii Y.-M. Ju & J. D. Rogers



Biscogniauxia schweinitzii Y.-M. Ju & J. D. Rogers, Mycotaxon 66: 53. 1998.

º Sphaeria macula Schwein., Schrift. Naturf.-Ges. Leipzig I, p. 31. 1822; non Tode, 1791; [nom. rejic., Art. 53.1].

º Nummularia macula (Schwein.) Cooke, Grevillea 12: 6. 1883.

º Hypoxylon maculum (Schwein.) J. H. Miller, Mycologia 33: 75. 1941.

º Numulariola macula (Schwein.) P. Martin, J. S. African Bot. 35: 293. 1969; [nom. inval., ICBN Art. 33.2]; J. S. African Bot. 42: 78. 1976.

º Biscogniauxia macula (Schwein.) Van der Gucht, Mycotaxon 45: 265. 1992.

Stromata erumpent, pulvinate, raised, 0.2-1.3 cm long x 0.2-0.5 cm broad x 0.6-1 mm thick, with sloped margins; mature surface black; carbonaceous immediately beneath surface and between perithecia; tissue beneath perithecia inconspicuous.

Perithecia obovoid, 0.3-0.5 mm diam x 0.4-0.7 mm high.

Ostioles lower than stromatal surface, with openings punctate, sometimes overlain with white substance.

Asci 105-130 mm total length x 12-13 mm broad, the spore-bearing part 90-115 mm long, the stipes 15-25 mm long, with apical ring bluing in Melzer's iodine reagent, discoid, 1.5-2 mm high x 5.5-6 mm broad.

Ascospores dark brown, unicellular, ellipsoid to subglobose, nearly equilateral, laterally compressed, with broadly rounded ends, smooth, 13-14.5 x 8.5-11.5 x 7-7.5 mm, with straight germ slit spore-length on both narrow edges.