Thallus olive-greenish to grey-brown or in parts oxydated rust-red, smooth, or in parts irregularly-cracked, matt or shining, ecorticate,prothallus absent, in irregular patches 1-4 cm diam. Perithecia scattered to frequent, solitary to 2 together, semi-immersed to sessile, hemispherical 0.05-0.2 mm diam., shining, black, often with a small central papilla. Involucrellum black, matt or shining, reaching to halfway down exciple, 86-100 µm thick. Paraphyses persistent, simple. Asci cylindrical-fusiform or narrowly clavate, thin-walled, 107-130 × 8-13 µm. Ascospores fusiform with pointed ends, (3-)5-7(-9)-septate, 73-86 × 8.1-13.5 µm.