Hypoxylon tortisporum Y.-M. Ju & J. D. Rogers



Hypoxylon tortisporum Y.-M. Ju & J. D. Rogers, A Revision of the Genus Hypoxylon, p. 196. 1996.

Stromata peltate to hemispherical, centrally attached to substrate, with entire margins, plane or with inconspicuous to conspicuous perithecial mounds, 1-2.2 cm diam x 0.8-1 cm thick; surface chestnut (40) or brown vinaceous (84); dull reddish brown to dull orange brown granules immediately beneath surface, with KOH-extractable pigments amber (47), isabelline (65), olivaceous (48), dull green (70), or gray olivaceous (107); the tissue below the perithecial layer massive, blackish, 6-9 mm thick, extending upwards into the space between perithecia.

Perithecia long tubular, 0.2-0.4 (-0.6) mm diam x 1-2.5 mm high.

Ostioles lower than the stromatal surface.

Asci 100-180 mm total length x 6.5-7.5 mm broad, the spore-bearing parts 50-70 mm long, the stipes 50-113 mm long, with apical ring bluing in Melzer's iodine reagent, discoid, 0.5-1 mm high x 2 mm broad.

Ascospores brown to dark brown, unicellular, ellipsoid, highly variable, with narrowly to broadly rounded ends, 9.5-14 (-16) x 4-6 mm, with straight to slightly sigmoid germ slit much less than spore-length; perispore indehiscent in 10% KOH; epispore smooth.