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



Hypoxylon dearnessii Y.-M. Ju & J. D. Rogers, A Revision of the Genus Hypoxylon, p. 106. 1996.

Stromata pulvinate to discoid, convex on top, constricted at base, with crenate margins, plane, (0.2-) 0.4-1 cm diam x 1.5-2.5 mm thick; surface dark brick (60), sepia (63), or grayish sepia (106) on top, black on sides; orange brown or dark brown granules immediately beneath surface, with KOH-extractable pigments sienna (8); the tissue below the perithecial layer whitish to grayish, 1-2 mm thick, extending into the space between perithecia.

Perithecia obovoid, 0.1-0.2 mm diam x 0.2-0.4 mm high.

Ostioles at the same level as or slightly higher than the stromatal surface.

Asci 120-140 mm total length x 6-7 mm broad, the spore-bearing parts 70-80 mm long, the stipes 50-65 mm long, with apical ring bluing in Melzer's iodine reagent, discoid, 0.8-1.2 mm high x 2.5-3 mm broad.

Ascospores brown to dark brown, unicellular, ellipsoid, nearly equilateral, with broadly rounded ends, (8-) 9-11.5 x 4.5-6 mm, with straight germ slit spore-length; perispore dehiscent in 10% KOH, smooth; epispore smooth.