Hypoxylon macrosporum P. Karst.

TELEOMORPH | CULTURES AND ANAMORPH | SPECIMENS EXAMINED | NOTES

TELEOMORPH

Hypoxylon macrosporum P. Karst., Bidrag Kännedom Finlands Natur Folk 1873: 40. 1873.

= Hypoxylon vogesiacum (Pers.) Sacc. var. macrosporum J. H. Miller, Mycologia 25: 325. 1933.

Stromata effused-pulvinate to pulvinate, with conspicuous perithecial mounds, usually with cracks along the valley of perithecial mounds, 0.3-6 cm long x 0.2-1.5 cm broad x 0.5-1.5 mm thick; surface purplish gray (128), becoming black when aged; dull reddish brown granules immediately beneath surface and between perithecia, with KOH-extractable pigments greenish olivaceous (90); the tissue below the perithecial layer grayish brown, inconspicuous to conspicuous, up to 1 mm thick.

Perithecia spherical to obovoid, 0.1-0.4 mm diam x 0.3-0.4 mm high.

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

Asci 190-260 mm total length x 13-16 mm broad, the spore-bearing parts 130-180 mm long, the stipes 50-90 mm long, with apical ring lightly bluing in Melzer's iodine reagent, discoid, 1.8-2 mm high x 5-6 mm broad.

Ascospores brown to dark brown, unicellular, ellipsoid, nearly equilateral, with narrowly rounded ends, sometimes with one or both ends broadened, 22-31 x (7.5-) 8.5-11 mm, with straight, continuous to discontinuous germ slit much less than spore-length; perispore indehiscent in 10% KOH; epispore smooth; finely dotted beneath epispore.