Hypoxylon nicaraguense Ellis & Everh.



Hypoxylon nicaraguense Ellis & Everh. apud C. L. Smith, Bull. Iowa Univ. Lab. Nat. Hist. 2: 407. 1893.

= Ustulina decipiens Rehm, ined.

Stromata peltate, centrally attached to substrate, sessile, with crenate to entire margins, plane or with inconspicuous perithecial mounds, 1.3-3 cm diam x 5-8 mm high; surface brown vinaceous (84), becoming fuscous (103) when aged; dark brown or blackish granules immediately beneath surface, with KOH-extractable pigments dark livid (80) or livid purple (81); the tissue below the perithecial layer massive, dark grayish brown, up to 7 mm thick, extending upwards into the space between perithecia.

Perithecia long tubular, 0.2-0.4 mm diam x 0.8-1.5 mm high.

Ostioles slightly higher than the stromatal surface.

Asci fragmentary in examined specimens, with apical ring bluing in Melzer's iodine reagent, discoid, 1 mm high x 2.5-3 mm broad.

Ascospores brown to dark brown, unicellular, ellipsoid-inequilateral, with narrowly rounded ends, (11.5-) 12-15 (-16) x 5-6.5 mm, with straight germ slit nearly spore-length; perispore indehiscent in 10% KOH; epispore smooth.