Mycosphaerella podagrariae  

Anamorph: conidiomata acervular, to 250 µm diam., amphigenous, subepidermal, peridium poorly developed except around the ostiole where it is black. Conidiogenous cells in a palisade lining the conidioma wall, shortly cylindrical, proliferating sympodially. Conidia 35-75 x 2.5-4 µm, vermiform, linear or subclavate, obtusely tapering at both ends, 1-septate, hyaline, guttulate.
Teleomorph: ascostromata perithecia, 90-120 µm diam., usually epigenous, black, globose to slightly flattened, superficial and surrounded by a dense hyphal network, densely crowded, almost seeming pseudostromatic. Interascal tissue not present. Asci 50-60 x 14-16 µm, 15-25 per ascoma, saccate to subcylindrical, with a thickened apex, sessile, 8-spored. Ascospores 18-19 x 5-6 µm, ellipsoidal to almost ovoid with rounded ends, 1-septate, the septum median, upper cell slightly broader than the lower one, not constricted at the septum, hyaline, smooth-walled.

The conidiomata are acervular and thus belong to Phloeospora, but a combination into this genus has not been made. Description partly adapted from an unpublished account by John David.