Thallus very thin, arachnoid, greyish-white or creamish, matt. Apothecia scattered to crowded, sessile, constricted at base, rounded to deformed through mutual pressure, 0.5-2.5 mm diam., persistently concave, disc pale yellow-brown to brown-black, matt, epruinose, margins thin, entire, persistent, crenulate, inflexed, white or grey-white, exciple buff, smooth to minutely verrucose. Epithecium granular, brown, 4-8 µm thick. Paraphyses simple, dense, 2-3 µm diam., apices capitate, brownish to 5 µm diam. Asci clavate 51 × 15-18 µm. Ascospores ellipsoid to broadly ellipsoid, uniseriate or biseriate, 11.9-17 × 6.8-8.3 µm. Chemistry: Atranorin, arthothelin, thiophaninic, stictic and norstictic (tr.) acids, accessory substance and pigment.