Anamorph: conidiomata acervular, 200-300 µm diam., subepidermal, circular or slightly irregular in outline, the upper wall devoid of fungal tissue and the basal wall composed of 2-3 layers of pale brown thin-walled angular cells, dehiscing by irregular splits. Conidiophores 20-33 x 3-5 µm, branched at the base and aboveseptate, rather irregular in form. Conidiogenous cells broad, cylindrical to obclavate, proliferating percurrently, a small collarette sometimes visible. Conidia of two types. Macroconidia 17.5-24 x 5.5-7 µm, falcate, the apex obtuse and the base truncate, aseptate, thin- and smooth-walled. Microconidia 4-6.5 x 2-3 µm, cylindrical to obclavate, hyaline, aseptate. Teleomorph: ascomata apothecia, 200-250 (-400) µm diam., erumpent through the host epidermis, ± cupulate but appearing discoid to pulvinate in a living state, pale to mid grey, without spines, developing from a pulvinate stroma. Exciple composed of 2-3 layers of brownish thin-walled angular to globose cells. Interascal tissue of filamentous ± unbranched paraphyses, the apices slightly swollen and sometimes pale brownish-pigmented. Asci developing from croziers, 65-105 x 18-21 µm, almost sessile, clavate, the apical region sometimes slightly attenuated, thin-walled and not fissitunicate, the apex obtuse to rounded, with a small apical ring that blues in iodine, 4- to 8-spored. Ascospores arranged ± biseriately, 16-22 x 7-9.5 µm, ellipsoidal to ovoid-ellipsoidal, aseptate, hyaline, thin- and smooth-walled, without a perispore or appendages.
Descriptions adapted primarily from Rimpau (1962) and Sutton (1980).