Thallus dingy grey-white, in part suffused rust-red, in irregular, smooth patches, to 5 cm diam., matt, areolate-cracked, areolae 1-3.5 mm wide, subangular, uneven, fissures narrow. Apothecia sessile to subinnate, often crowded and ± deformed, 1-4(-6)-confluent, black, matt, epruinose, cracked, 0.1-0.6(-1.0) mm diam., plane to subconvex, uneven, margins narrow, entire or flexuose, concolorous with disc. Epithecium grey-green to black, 4-10 µm thick. Hymenium colourless, 35-50 µm tall. Hypothecium ochre-brown. Ascospores subcylindrical-oblong, 8.3-10.2 × 3-5.1 µm.