Description contributed by Graham Kinsey, CABI, based on Wehmeyer (1933).
Anamorph: Phomopsis pulla (Sacc.) Traverso (1906). Conidiogenous cells 15-16 x 1 µm. Alpha-conidia 8 x 2 µm.
Teleomorph: stromata on host surface as scattered or loosely clustered ostioles emergent through small breaks in the periderm or where the periderm is sloughed off through the blackened bark surface, entostroma irregularly pustulate-effuse and strongly differentiated. Ascomata 400-600 µm diam, irregularly scattered or loosely clustered, ostioles cylindrical to sinuous-filiform and shiny black. Asci 35-45 x 5-6.5 µm, clavate. Ascospores 9-13 x 2-2.5 µm, narrow ellipsoidal-fusiform.