Thallus pale grey to white, rather thick (c. 50-200 µm), wrinkled and irregularly cracked to nearly smooth, occasionally more strongly uneven, densely verrucose, verrucae 0.2-0.3 mm diam., and 0.2-0.3 mm tall, often overgrowing bryophytes on bark, very irregular in shape, soredia and isidia absent. Apothecia scattered, 0.8-3.5 mm diam., disc plane or subconvex, black or rarely brown, pale grey-pruinose, dull, margins prominent, thick, black, epruinose or rarely pruinose in a narrow rim around disc, slightly glossy. Epithecium olive-green to olive-brown or pale yellow-brown to dark brown or almost black, diffuse, granular in upper part, 7-14(-24) µm thick. Hymenium 120-160 µm tall, I+ blue. Ascospores 1 per ascus, 1-septate, straight, 80-165 × 25-43 µm, wall 2 µm thick, epispore 1 µm thick, warted. Chemistry: Pannarin (Pd+ orange) and zeorin.