Hypoxylon laurus J. H. Miller



Hypoxylon laurus J. H. Miller, Monogr. of the World Species of Hypoxylon, p. 66. 1961.

Stromata pulvinate to discoid, erumpent, usually encircled with ruptured plant tissue, plane or with inconspicuous perithecial mounds, 1.5-4 mm diam x 1-2 mm thick; surface black, with sepia (63) tone; black carbonaceous tissue immediately beneath surface, without apparent KOH-extractable pigments; the tissue below the perithecial layer white to grayish, coriaceous to fibrous, ca. 1 mm thick, extending upwards into the space between perithecia.

Perithecia obovoid, 0.3-0.5 mm diam x 0.4-0.6 mm high.

Ostioles slightly higher than the stromatal surface, papillate.

Asci 120-140 mm total length x 6-7.5 mm broad, the spore-bearing parts 55-70 mm long, the stipes 60-70 mm long, with apical ring bluing in Melzer's iodine reagent, discoid, 0.5 mm high x 2.5-3 mm broad.

Ascospores brown to dark brown, unicellular, ellipsoid-inequilateral, with narrowly rounded ends, 8-10 x 3.5-4.5 mm, with straight to slightly sigmoid germ slit spore-length; perispore dehiscent in 10% KOH, with faint coil-like ornamentation; epispore smooth.