Ascomata perithecial, 150-200 µm, globose to globose, shining black, smooth or faintly roughened, superficial, scattered or in small clusters amongst the conidiophores. Peridium composed of an outer layer of dark brown textura epidermoidea with cells to 2 µm diam, and an inner layer of flattened thin-walled hyaline textura angularis. Interascal tissue composed of numerous thin-walled simple persistent paraphyses to 3 µm diam. Asci 65-90 x 7-9 µm, cylindrical, short-stalked, thin-walled at all stages, with an inconspicuous J- apical ring to 2 µm diam and 0.5 µm thick, 8-spored. Ascospores arranged obliquely uniseriately to biseriately, (10-) 12-16 x 3.5-4 (-4.5) µm, fusiform with rounded ends, eventually 1- and then 3-septate, hyaline, thin- and smooth-walled, without mucous sheath or appendages.
Anamorph: Chloridium botryoideum. Conidiomata absent. Conidiophores often dimorphic; one 100-250 µm long, 3-4 (-5) µm wide, dark brown, thick-walled, setiform, rarely sympodially proliferating; the other 20-40(-100) µm long, 2-3 µm wide, pale brown, repeatedly proliferating sympodially. Conidiogenous cells hardly differentiated from the conidiophore, cylindrical or slightly tapering, the apex very narrow (ca 1 µm diam), almost hyaline with a short collarette, proliferating percurrently and also sympodially. Conidia (2.5-) 3-4.5 (-5) x 1-1.5 µm, ellipsoidal to subglobose or ovoid, the base sometimes apiculate, hyaline, thin-walled, aseptate.