Teleomorph: stromata 0.5-1.75 mm diam, multilocular, rounded, cushion-shaped to plane, gregarious to crowded, occasionally confluent, black, smooth, immersed, becoming erumpent, composed of dark brown to blackish thick-walled angular and prismatic cells becoming darker and thicker-walled towards the outer layers. Ascomatal locules forming a marginal ring, without conspicuous ostioles. Interascal tissue absent or visible only as slight remnants of interascal pseudoparenchyma. Asci 50-88 x 8-12 µm, cylindrical to clavate, somewhat saccate, short-stalked, thick-walled, fissitunicate, J-, 8-spored, arising parallel to each other from the entire base of the locule or rarely on a slight basal cushion of hyaline cells. Ascospores 18-30 x 5-8 µm, hyaline, smooth, with 1 (-5) transverse septa, longitudinal septa absent, constricted at the primary septum.