Diaporthe padi  

Description contributed by Graham Kinsey, CABI, based on Wehmeyer (1933).

Anamorph: Phomopsis padina (Sacc. & Roum.) Died. (1911). Alpha-conidia 9-11 x 3 µm.

Teleomorph: stromata on host surface as circular to fusoid, pustulate discs 0.2-1 mm diam, consisting of a compact cluster of ostioles, discs not strongly erumpent, entostroma strongly differentiated, pustulate areas sometimes confluent and appearing ± evenly effuse. Ascomata 320-640 x 240-400 µm, usually clustered, sometimes irregularly crowded, often causing pustulate swellings of the entostroma, collectively erumpent, the ostioles short, stout, cylindric, punctate. Asci 60-75 x 7-10 µm, clavate, with a refractive apical ring. Ascospores 13-18 (-19) x 2.5-4 µm, fusiform-ellipsoidal, constricted at the septum.