Thallus whitish to pale grey, dispersed, warty or rimose-areolate, prothallus blackish or evanescent, saxicolous. Apothecia lecanorine, adnate to sessile, to 0.8 mm diam., disc black, slightly white-pruinose, plane, becoming convex, margins entire, persistent, ± crenate. Hymenium 90-110 µm tall. Epihymenium pale brown with a granular epipsamma (Pd+ forming orange to red crystals). Hypothecium colourless. Paraphyses small, compact, branched. Ascospores of -type with changeovers to -type, torus well-developed, 16-22 × 10-13 µm, wall finely warted. Chemistry: K+ yellow, Pd+ red. Atranorin and pannarin.