Description contributed by Graham Kinsey, CABI, based on Wehmeyer (1933).
Anamorph: Phomopsis euphorbiae (Sacc.) Traverso (1906). Alpha-conidia 7 x 3-3.5 µm, ovoid-cylindrical.
Teleomorph: stromata on host surface as small, 1-10(-15) x 1-3 mm, fusiform or elliptical blackened patches, or as more widely effuse areas, ventral zone definite in the wood, margin sharp but not prominent. Ascomata scattered singly. Ascospores 9-12 x 2.5-3.5 µm.
Wehmeyer considered this to belong within the D. pardalota aggregate. The stroma margin is less sharply defined than it is in some other members of the 'pardalota' group.
On dead stems of Euphorbia.
From England (Herefs, West Kent, Worcs); anamorph additionally from Wales (Cards).