Thallus greyish or bluish-grey to whitish, in irregular patches 0.5-2(-3) cm diam., thick, chinky, areolate-cracked, areolae angular, complicate, ± subconvex or flat, surface matt, rather scabrid-roughened to fibrous, saxicolous. Apothecia prominent, round to irregular, scattered, solitary or 2-3-confluent and deformed through mutual pressure, disc matt, black, epruinose, often ± etched, plane to subconvex 0.5-1.2 mm diam., ± innate, not raised above thallus surface, margins black, raised, entire to crenulate. Epithecium brown-black, granular, 4-10(-21) µm thick. Paraphyses dense, simple, slightly thickened and brownish at apices. Exciple carbonised on outer wall or completely carbonised. Hymenium yellow-brown, 60-90 µm tall. Hypothecium dark yellow-brown or black, 40-55 µm thick. Ascospores ellipsoid, 9-14 × 5-6 µm.