Anamorph: not known.
Teleomorph: ascomata (550-) 600-850 x (160-) 200 x 330 (-380) µm [160-220 x 140-180 µm in dried material examined], cylindrical to slightly club-shaped with a rounded apex, circular in cross section or compressed on two sides, straight, seldom a little curved, light to dark brown [black in the dried material examined], with a white frosted or fine felted surface which can break down, especially in old age; on the substrate loosely attached to a usually pronounced hyphal mat. Ostiole a pale disc to 50-90 µm diam., lined with periphyses. Interascal tissue of paraphyses, ca 1.5 µm diam., sparsely branched and anastomosed. Asci 350-550 x (9 -) 10-12 (-13) µm, cylindrical, rounded at the apex, fairly thick-walled and fissitunicate, not blueing in iodine, 8-spored. Ascospores fasciculate, usually not helically coiled, filiform, shorter than the asci and 2-2.5 µm diam., the apex obtuse and the base acuminate, multiseptate with the segments 3.8-8.2 µm long, eventually becoming pale brown, smooth.
Description in part translated from Döbbeler (1979).
On a wide range of mosses, including Hypnum resupinatum and Leskea polycarpa (Greiff, pers. comm.); apparently with necrotrophic nutrition.
In GBI, reported from VC10 Isle of Wight, VC35 Monmouth and VC64 MW Yorkshire.