Description contributed by Graham Kinsey, CABI, based on Wehmeyer (1933).
Anamorph: not known.
Teleomorph: stromata on host surface as numerous, minute, conical pustules through which the ostioles are separately erumpent or as widely blackened areas of the periderm or bark or wood, dorsal blackening sometimes absent when immature but usually present at maturity. Ascomata 320-480 x 240-320 µm, irregularly scattered or crowded, but erumpent singly, ostioles short-conical and spine-like. Asci 40-47 x 4-7 µm, clavate. Ascospores 10-14 x 1.5-2 µm, long narrow-fusiform, straight or slightly curved, ultimately 1-septate, not constricted at the septum, 4-guttulate.