CULTURAL CHARACTERISTICS: OA and ME; colonies 15-25 mm diam. after growing 7 days in darkness, 20°C; aerial mycelium short, cottony, grey; agar surface dark grey, often undulate; reverse grey. Pycnidia 70-100 µm diam., globose, single ostiole, often take several weeks to form. Walls of 1-2 layers of pale brown pseudoparenchymatous cells, lined with ampulliform, hyaline, phialidic conidiogenous cells. Conidia hyaline, oblong-elliptic, nonseptate, (3-)3.5-4.5 x 1-1.5 µm.

INOCULATIONS: The fungus initiated no obvious disease reaction in the test plants. A few pycnidia were found forming in the band of dead tissue immediately surrounding some of the wound sites.