Kretzschmariella culmorum (Cooke) Y.-M. Ju & J. D. Rogers
TELEOMORPH | CULTURES AND ANAMORPH | SPECIMENS EXAMINED | NOTES
Kretzschmariella culmorum (Cooke) Y.-M. Ju & J. D. Rogers, Mycotaxon 51: 242.
º Hypoxylon culmorum Cooke, Grevillea 7: 51. 1878.
= Kretzschmariella guaduae Viégas, Bragantia 4: 105. 1944.
? = Auerswaldia bambusicola Speg., Anal. Soc. Cient. Argent. 19: 246. 1885.
º Hypoxylon bambusicolum (Speg.) Speg., Anal. Soc. Cient. Argent. 26: 31. 1888.
Hypoxylon nummularioides Rehm var. microspora J. H. Miller, ined.
Stromata effused-pulvinate, orbicular to elliptical, usually containing multiple perithecia, gregarious, superficial (probably subcuticularly erumpent), 1-5 mm long x 1-4 mm broad x 0.2-0.4 mm thick; surface gray at first, becoming black, plane to slightly undulate; outer crust thin, black, carbonous; interperithecial tissue whitish, soft, becoming brownish, disintegrated when aged; tissue lacking below the perithecial layer.
Perithecia flattened-spherical, 0.2-0.3 mm diam x 0.1-0.2 mm high. Ostioles faintly papillate.
Asci eight-spored, cylindrical, uniseriate, short-stipitate, 90-100 µm total length x 9.5-14 µm broad, the spore-bearing part 84-93 µm long, with apical ring bluing in Melzer's reagent, inverted hat-shaped, 3-4.5 µm diam x 2.5-4 µm high.
Ascospores brown to dark brown, unicellular, ellipsoid-inequilateral, smooth, with narrowly rounded ends, 13-17.5 x 5-7.5 µm, with straight germ slit slightly less than spore-length to spore-length on the flattened side, usually bearing a cellular appendage on immature ascospores and sometimes on mature ascospores, with hyaline sheath closely appressed to the ascospore proper.