Thallus pale grey to pale greenish-grey, thin, slightly wrinkled or smooth, occasionally thicker and cracked, soredia and isidia absent. Apothecia scattered 0.6-2.1 mm diam., disc consistently plane, brown, with scattered, coarse, whitish pruina, dull, margins prominent, narrow, black, epruinose, glossy. Epithecium pale yellow-orange or red-brown, diffuse, with a granular upper layer, 18-24 µm thick. Hymenium 180-250 µm tall, I+ dark blue. Ascospores 4-8 per ascus, ovoid to subglobose, straight, muriform, 45-80 × 23-32 µm (10-14 transverse septa and 4-5 vertical septa). Chemistry: KC-, Pd+ orange. Pannarin and zeorin.