Thallus in irregular patches to 3 cm diam., 0.1 mm thick, grey-white or pale greenish-grey-white, with a faint, livid-reddish tinge, roughened or minutely wrinkled, matt, continuous or ± cracked, smooth in parts.Apothecia crowded, approximate, to 1-6 confluent, sessile, or often ± innate or only very slightly raised above surface of thallus, round to irregular, 0.3-2.0 mm diam., flattened, plane to convex, disc with a thin, minutely granular, ochre pruina, blackish when wet, margins persistent, black, entire or flexuose. Epithecium granular, brown-black, 13-20 µm thick. Hymenium colourless or pale straw-coloured, 65-90 µm tall. Hypothecium brown or purple-black, thick. Ascospores ellipsoid, 11-15 × 4.5-6 µm.