Conidiomata Group AII (type a7), semi-immersed in bark, erumpent when mature, discoid to conical, 450–750 μm diam, with multi-locule. Conceptacle prominent. Ectostromatic disc white, circular, 85–160 μm diam, with single ostiole per disc in the centre. Ostiole circular to ovoid, black, 35–55 μm diam. Locules multiple, subdivided with common walls. Conidiophores hyaline, unbranched or occasionally branched, 10.5–18.5 × 1–2 μm (av. = 13.8 ± 1.3 × 1.6 ± 0.1 μm, n = 30). Conidiogenous cells enteroblastic, phialidic, subcylindrical to cylindrical, 7.5–11.5 × 1–2 μm (av. = 10.2 ± 1.1 × 1.5 ± 0.1 μm, n = 30). Conidia hyaline, unicellular, eguttulate, elongate-allantoid, 6–8 × 1.5–2 μm (av. = 7.3 ± 0.3 × 1.7 ± 0.1 μm, n = 50). Culture characteristics: Colonies on PDA white, reaching 9-cmdiameter after 6 d at 25 °C, flat, felt-like, with aerial mycelium.

Typus: Germany, on bark, Hoffmann (lectotype designated here plate VI, fig. 3 in Hoffmann (1787), MBT 10017544). Switzerland, on Populus nigra, unknown date, G. Défago (epitype designated here CBS H-19169, MBT 10017505, ex-epitype culture CBS 258.34).