Hypoxylon intermedium (Schwein.: Fr.) Y.-M. Ju & J. D. Rogers



Hypoxylon intermedium (Schwein.: Fr.) Y.-M. Ju & J. D. Rogers, A Revision of the Genus Hypoxylon, p. 133. 1996; non Speg., 1884.

º Sphaeria intermedia Schwein., Trans. Amer. Philos. Soc., n. ser., 4: 189. 1832; Schwein.: Fr., Syst. Mycol. Index, p. 167. 1832.

º Enslinia intermedia (Schwein.: Fr.) Sacc., Syll. Fung. II, p. 813. 1883.

= Sphaeria argillacea Pers., Ann. Bot. (Usteri) 11: 23. 1794; non Fr.: Fr., 1823; [nom. rejic., ICBN Art. 13.1 (d)].

º Hypoxylon argillaceum (Pers.) Nitschke, Pyren. Germ., p. 29. 1867; non (Fr.: Fr.) J. Kickx fil., 1835.

º Hypoxylon milleri De Hoog, Stud. Mycol. 15: 192. 1977.

= Hypoxylon fraxinophilum Pouzar, Ceská Mykol. 26: 131. 1972.

Stromata hemispherical, with inconspicuous to conspicuous perithecial mounds, 2-4 mm diam x 1.5-2.5 mm thick; surface vinaceous buff (86) or grayish sepia (106); dark brown granules immediately beneath surface, with KOH-extractable pigments pure yellow (14) or greenish yellow (16); the tissue below the perithecial layer whitish to grayish, becoming blackish, 1-2 mm thick, extending upwards into the space between perithecia.

Perithecia spherical to obovoid, 0.3-0.4 mm diam x 0.3-0.5 mm high.

Ostioles lower than the stromatal surface.

Asci 190-230 mm total length x 12-16 mm broad, the spore-bearing parts 90-120 mm long, the stipes 80-120 mm long, with apical ring highly reduced or lacking, not bluing in Melzer's iodine reagent.

Ascospores dark brown to blackish brown, unicellular, ellipsoid-inequilateral, with narrowly rounded ends, 14-20.5 x 7-9.5 mm, with straight germ slit spore-length; perispore dehiscent in 10% KOH, with inconspicuous coil-like ornamentation; epispore smooth.