Anamorph: colonies sporodochial, 0.1-0.5 mm diam., circular and ± plane to punctiform or hemispherical, convex and wart-like, scattered on the surface of the host lichen, often occurring where isidia have been abraded, clearly delimited, dark brown to black. Stroma poorly developed or ± absent, setae and hyphopodia absent. Conidiophores poorly differentiated from vegetative cells, subglobose to ellipsoid or polyhedral, 4-6 (-8) µm diam., usually hyaline but sometimes becoming pale brown in parts. Conidiogenous cells 4-10 x 3-7 µm, subglobose, shortly cylindrical or ellipsoidal, sometimes rather inflated, hyaline to pale brown. Conidia arising in compact, rather irregular but frequently almost biseriate dry chains, (8-) 10-15 (-17) µm overall, irregularly subglobose to ellipsoidal, composed of 2-6 (-9) ± fused subglobose cells, walls moderately thick and ± smooth (sometimes becoming slightly uneven), brown to dark brown, almost black in mass, individual cells (4-) 6-10 µm diam. Teleomorph: not known.