Anamorph: conidiomata 60-750 µm diam. and 60-150 µm tall, cupulate, synnematous or rarely sporodochial, spore mass shiny black, enclosed by thin marginal hyphae and setae, when synnematous 150-350 µm tall and 30-50 µm diam., the black stipe composed of elongated conidiophores clothed by marginal hyphae with setae arising at the base. Excipular hyphae not strongly differentiated from the conidiophores, but sometimes with the apical cells brown and slightly verrucose. Setae to 200 (-400) µm long and 9 µm diam. at the base, gradually tapering to an acuminate apex, mid brown, very thick-walled (to 2.5 µm thick), with thin remote septa. Conidiophores in a compact palisade, repeatedly dichotomously or trichotomously branched, the ultimate branches bearing clusters of 2-4 conidiogenous cells. Conidiogenous cells 6.5-13 x 2.5-3.5 µm, cylindrical or slightly tapering, hyaline, proliferating percurrently. Conidia (7-) 10-13 x 1.8-2.5 µm, narrowly fusiform, the apex acute and the base truncate and sometimes protruding, greenish to olivaceous, sometimes with a fan-shaped gelatinous appendage at the apex.
Teleomorph: not known.
Description partially adapted from Tulloch (1972). The material studied has pigmented setae rather than the hyaline structures described by Tulloch; these may have been of material in culture.
Not formally assessed. Only reported from three sites in GBI, but almost certainly greatly under-recorded.
On dead culms and leaves of grasses (?Danthonia decumbens) and sedges (Carex extensa and C. panicea). Probably not host-specific.
Reported from VC69 Westmorland, VC93 N Aberdeen and VC97 W Inverness.