Hypoxylon stygium (Lév.) Sacc.

TELEOMORPH | CULTURES AND ANAMORPH | SPECIMENS EXAMINED | NOTES

TELEOMORPH

Hypoxylon stygium (Lév.) Sacc., Syll. Fung. I, p. 379. 1882.

º Sphaeria stygia Lév., Ann. Sci. Nat. Bot., sér. III, 5: 258. 1846.

º Nummularia stygia (Lév.) C. G. Lloyd, Mycol. Writings 7: 1312. 1924.

= ? Sphaeria osculosa Pers. apud Gaudichaud in Freycincet., Bot. Voy. Aut. Mond. Uram. Phys., p. 180. 1826.

= Hypoxylon stigmoideum Ces., Atti Accad. Sci. Fis. 8: 17. 1879.

= Hypoxylon platystomum Ellis & Everh., N. Amer. Pyren., p. 649. 1892.

= Nummularia rufa Ellis & Everh. apud C. L. Smith, Bull. Lab. Nat. Hist Iowa State Univ. 2: 406. 1893.

= Hypoxylon bogoriense Höhn., Sitzungsber. Kaiserl. Akad. Wiss. Math.-Naturwiss. Cl., Abt. 1, 118: 341. 1909.

= Hypoxylon punctatum Petch, Ann. Roy. Bot. Gard. (Peradeniya) 8: 153. 1924; non (L.: Fr.) Grev., 1828; [nom. rejic., ICBN Art. 64.1].

Stromata pulvinate to effused-pulvinate, with inconspicuous perithecial mounds, 1-10 cm long x 0.5-3 cm broad x 0.4-1 mm thick; surface blackish, with reddish brown tone; dull reddish brown granules immediately beneath surface and between perithecia, with KOH-extractable pigments greenish olivaceous (90) or dull green (70); the tissue below the perithecial layer inconspicuous.

Perithecia obovoid, 0.2-0.3 mm diam x 0.3-0.5 mm high.

Ostioles papillate, encircled with a convex truncatum-type disc 0.1-0.2 mm diam.

Asci 55-90 mm total length x 3-4 mm broad, the spore-bearing parts 45-65 mm long, the stipes 10-30 mm long, with apical ring bluing or faintly bluing in Melzer's iodine reagent, discoid, 0.5 mm high x 1 mm broad.

Ascospores light brown, unicellular, ellipsoid-inequilateral, with narrowly rounded ends, 5-7 x 2-3 mm, with straight germ slit spore-length on flattened side; perispore dehiscent in 10% KOH, smooth; epispore smooth.