Ascomata to ca 700 µm diam, perithecial, ± globose to ovoid, not or minutely papillate, blackish except around ostiole where cells are sometimes reddish to orange, not setose, gregarious to crowded, superficial. Subiculum woolly, sparse to abundant, composed of rarely branched red-brown, smooth, thick-walled hyphae 5-7 µm diam; as scant basal hyphae or as a dense layer around individual ascomata or continuous and surrounding many ascomata. Peridium 30-50 µm thick, composed of angular, brown, polyhedral cells, darker and with thicker walls at the outer surface, paler and compressed at the inner surface, becoming distinctly prismatic, ± elongated and glassy greenish-brown to yellowish or hyaline at the apex and sometimes with red pigment, ostiole lined with or entirely plugged with hyaline to yellowish parallel hyphae probably continuous with the interascal tissue. Interascal tissue of trabeculate pseudoparaphyses 1.5-2.5 µm diam, hyaline, filiform, septate, branched and anastomosed, continuous from top to bottom of the cavity at least initially. Asci 100-150 x 10-14 µm, cylindrical-clavate, apex rounded, base tapering to a lobed and often foot-shaped base, thick-walled, sometimes with an internal apical beak, fissitunicate, 8-spored, J-, arising in parallel from the lower half of the cavity. Ascospores 32-40 x 6-7 µm, 1-septate, later 3-septate, smooth, hyaline becoming brown, ellipsoidal to fusiform, often guttulate, constricted at the primary septum, secondary septa often faint, sometimes with a gelatinous coating which is particularly prominent at the ends.
AnamorphPyrenochaeta-like. Conidiomata 70-500 µm diam, pycnidial, globose to subglobose or hemispherical, wall composed of angular cells, with long stiff unbranched hypha-like setae, ostiolate. Conidiogenous cells 5-10 x 3-6 µm, nearly globose or elongated, proliferating percurrently, with a collarette, solitary or in chains. Conidia 2.5-4 x 1.5-3 µm, globose, elliptical or allantoid, hyaline, aseptate.