Kretzschmaria macrosperma (Mont.) J. D. Rogers & Y.-M. Ju



Kretzschmaria macrosperma (Mont.) J. D. Rogers & Y.-M. Ju, Mycotaxon 68: 359. 1998.

º Hypoxylon macrospermum Mont., Ann. Sci. Nat. Bot., sÚr. II, 13: 351. 1840.

º Ustulina macrosperma (Mont.) Sacc., Syll. Fung. I, p. 351. 1882.

= Hypoxylon fragaria Ces., Atti Accad. Sci. Fis. 8: 18. 1879.

= ? Hypoxylon gigaspermum Henn. & E. Nyman apud Warb., Monsunia 1: 168. 1899.

= Hypoxylon nucigenum Henn., Hedwigia 47: 259. 1908.

= Hypoxylon nucele C. G. Lloyd, Mycol. Writings 7: 1180. 1923.

= Holttumia congregata C. G. Lloyd, Mycol. Writings 7: 1285. 1924.

Stromata spherical, depressed-spherical, hemispherical, or applanopulvinate, discrete or densely aggregated, 0.4-5 cm diam x 0.5-3 cm high, attached to substrate with narrow connectives or short stipes; surface dull ochraceous brown, dark brown to blackish brown, cracked into distinctive polygonal scales; carbonaceous immediately beneath surface; tissue between and beneath perithecia coriaceous to woody, white to gray, becoming dark brown and disintegrating.

Perithecia spherical to obovoid, 2.5-4(-5) mm diam x 2.5-5.5 mm high.

Ostioles obtusely conical.

Asci fragmentary, with apical ring bluing in Melzer's iodine reagent, urn-shaped, 9-12 mm high x 6-8 mm broad.

Ascospores blackish brown, unicellular, ellipsoid-inequilateral, with broadly or, infrequently, narrowly rounded ends, smooth, 45-67 x 12.5-17.5(-20) mm, with straight germ slit spore-length or nearly so.