Biscogniauxia fuscella (Rehm) San Martín & J. D. Rogers
TELEOMORPH | CULTURES AND ANAMORPH | SPECIMENS EXAMINED | NOTES
TELEOMORPH
Biscogniauxia fuscella (Rehm) San Martín & J. D. Rogers, Mycotaxon 47: 233. 1993.
º Nummularia fuscella Rehm, Ann. Mycol. 2: 176. 1904.
º Hypoxylon fuscellum (Rehm) J. H. Miller, Mycologia 25: 325. 1933.
º Numulariola fuscella (Rehm) P. Martin, J. S. African Bot. 35: 292. 1969; [nom. inval., ICBN Art. 33.2]; J. S. African Bot. 42: 77. 1976.
= ? Diatrype exutans Cooke, J. Linn. Soc., Bot. 17: 143. 1878.
º Hypoxylon exutans (Cooke) Cooke, Grevillea 8: 66. 1879.
º Anthostoma exutans (Cooke) Sacc., Syll. Fung. I, p. 296. 1882.
º Nummularia exutans (Cooke) Cooke, Grevillea 12: 8. 1883.
º Hypoxylon nummularium Bull.: Fr. var. exutans (Cooke) J. H. Miller, Monogr. of the World Species of Hypoxylon, p. 124. 1961.
º Numulariola exutans (Cooke) P. Martin, J. S. African Bot. 35: 304. 1969.
º Biscogniauxia nummularia (Bull.: Fr.) Kuntze var. exutans (Cooke) Van der Gucht, Mycotaxon 45: 266. 1992.
º Biscogniauxia exutans (Cooke) Barr, Mycotaxon 46: 392. 1993.
Stromata applanate, fragmentary, up to 3 cm long x 1 mm thick; outer dehiscing layer white or buff-colored, thin; mature surface pale mouse gray, becoming grayish sepia and eventually fuscous; carbonaceous immediately beneath surface; gray to grayish brown, woody between perithecia, with carbonaceous stromatal layer discretely enclosing each perithecium; tissue beneath perithecia enclosed in black, sac-like fungal tissue that is continued from margins of stromata, composed largely of host tissue, ca. 0.5 mm thick.
Perithecia obovoid to tubular, 0.3-0.4 mm diam x 0.5 mm high, sometimes with several sharing a common ostiolar canal.
Ostioles higher than stromatal surface, with openings slightly papillate to papillate.
Asci 105-125 mm total length x 8.5-10 mm broad, the spore-bearing parts 95-110 mm long, the stipes 10-18 mm long, with apical ring bluing in Melzer's iodine reagent, discoid, 1-1.5 mm high x 3.5-4.5 mm broad.
Ascospores brown to dark brown, unicellular, ellipsoid, short fusoid, or pyriform, nearly equilateral, with narrowly rounded ends sometimes pinched, smooth, 13-16.5 x 6.5-8 mm, with straight germ slit spore-length, with a cellular appendage on immature ascospores and some mature ascospores.