Description contributed by Graham Kinsey, CABI.
Causing circular to fusoid pustulate ruptures of host periderm which are often laterally elongated, bark surface irregularly blackened.
Anamorph: Phomopsis ambigua (Sacc.) Traverso (1906). Conidiophores to 20 x 1-2.5 µm. Alpha-conidia 7-10 x 2-4 µm; beta-conidia 15-36 x 1-1.5 µm.
Teleomorph: Ascomata scattered irregularly or crowded in bark or wood, ostioles erumpent singly or in small clusters and stout or slightly elongated. Ascospores 11-14 x 2.5-4 µm.
Wehmeyer considered this to belong within the D. eres aggregate.
On living branches and fruit of Malus, Pyrus and Sorbus.
Probably widespread in England as the anamorph but the teleomorph is less frequent. Also known from Wales; anamorph additionally from Scotland (Mid & North Ebudes).