Anamorph: Conidial stromata 1-4 mm long, effuse, black, smooth and glossy, the conidiomata visible from the surface as shallow domed structures. Conidiomata to 200 µm diam, immersed, effuse, separate or confluent, of thin-walled pale brown angular cells, overlain by a layer of dark brown thick-walled cells which extend beyond the locules and cover the substrate, opening by irregular fissure. Conidiophores cylindrical, sparsely branched at the base, 1- to 2-septate, with acrogenous conidia formed all around the locular cavity. Conidiogenous cells 9-16 x 3.5-4 µm, cylindrical or long flask-shaped, hyaline or pale brown, smooth, proliferating percurrently, determinate, integrated or discrete, collarette and channel minute. Conidia 17-25 x 3.5-4.5 µm, ± cylindrical to fusiform, straight or ± curved, hyaline, simple, smooth, thin-walled, guttulate. Teleomorph: a teleomorph variously assigned to Aporhytisma or Diaporthopsis has been claimed, but the connection between the morphs needs confirmation.