Ascocarps innate-erumpent, depressed-pulvinate, circular or irregular in outline, densely gregarious, smooth, black; locules single or occasionally several, thick lenticular, astomous (FIG. 1, A, B); asci polysporous (24 or more spores), cylindric-clavate, short stipitate, 90-115 X 12-15 u, aparaphysate; spores when mature muriform with 3 transverse septa and frequently 1 or rarely 2 longitudinal septa in the upper cells, clavate, constricted in the middle, upper half broader, hyaline, 15-18 X 5-6 x. Conidia in culture hyaline, 1-celled, 8-15 X 4-6 e in size, borne on the mycelium as in Dematium; pycnidia in culture on sterilized willow twigs resemble those of the genus Dothichiza Lib., producing hyaline, 1-celled spores, 6-10 X 3-5 /u in size.