Description contributed by Graham Kinsey, CABI, based on Weymeyer (1933).
Anamorph: Phomopsis juglandina (Sacc.) Höhn. (1906). Conidiogenous cells 25 x 1-1.5 µm. Alpha-conidia 10-12 x 3-4 µm; beta-conidia 16-20 x 1 µm.
Teleomorph: stromata on host surface as small pustulate ruptures or when well developed as erumpent ostioles, surface of bark blackened, ventral zone in wood. Ascomata irregularly scattered or crowded or in large clusters, ostioles long-filiform and sinuous, erumpent singly or in clusters. Ascospores 10-14 x 2.5-4 µm.
Wehmeyer considered this to belong within the D. rudis aggregate.