Thallus pale greyish or yellowish or sordid grey-brown, smooth, matt, areolate-cracked, areolae rounded or angular, widely dispersed, 3-4 mm diam., becoming confluent, roughened in parts, prothallus black, stellate-fimbriate, radiating 0.5-2 mm wide, in irregular patches 0.3-1.5 cm diam., saxicolous. Apothecia clustered, innate ± sessile, solitary to 1-3-confluent, flat, 0.1-1.0 mm diam., disc black, matt, epruinose, often obscuring areolae, margin thin, black, entire, persistent. Hymenium brown-black above, colourless below, 110-115 µm tall. Hypothecium thick, colourless. Ascospores biseriate ellipsoid to ovoid, apices round or pointed, straight or slightly curved and ± fabiform, slightly constricted at septum 12-16 × 6-6.4 µm.