Dothiora pyrenophora  

Anamorph: Dothichiza sorbi Lib. (1880). Conidiomata ca 0.5 mm diam, pycnidial, black, erumpent on natural substrate (and formed in culture fide Sivanesan), gregarious to crowded. Conidia 4-8 x 2.5-4 µm.

Teleomorph: stromata 0.5-1.0 mm diam, rounded, cushion-shaped to plane, gregarious to crowded, occasionally confluent, black, smooth, immersed becoming erumpent, composed of dark brown to blackish thick-walled angular and prismatic cells becoming darker and thicker-walled towards the outer layers. Ascomatal locules forming a marginal ring, without conspicuous ostioles. Interascal tissue absent or visible only as slight remnants of interascal pseudoparenchyma. Asci 60-90 x 12-15(-22) µm, cylindrical to clavate, somewhat saccate, short-stalked, thick-walled, fissitunicate, J-, 8-spored, arising parallel to each other from the entire base of the locule or rarely on a slight basal cushion of hyaline cells. Ascospores 24-37 x (5-)6-12 µm, hyaline, smooth, with 6-10 transverse septa, frequently with longitudinal septa, constricted at the primary septum, constricted at all septa when fully mature and sometimes degenerating to part-spores.