Thallus poorly developed, pale grey-white or whitish, blotchy, ± wrinkled-papillate or minutely shallowly verrucose or cracked, effuse or lacking. Apothecia conspicuous, scattered or close together, sessile, constricted at base, round to irregular, 0.2-1.2 mm diam., disc matt or shining, black, epruinose, subconcave to plane, margins persistent, narrow, slightly raised, ± flexuose, concolorous with disc. Epithecium dense, black or brownish-olive, 8-13 µm thick. Hymenium colourless 80-90 µm tall. Hypothecium dark brown-black, 100-150 µm thick. Ascospores rare, 7-8 × 3-3.5 µm.

Thallus very thin or lacking, dingy greyish-fawn, discontinuous in ± scattered granules, often ± lost in interstices of rock. Apothecia sessile, black, matt, epruinose, ± dispersed, solitary to 1-4-confluent, rounded to irregular, 0.1-2.0 mm diam., at first plane, with a narrow, raised, black proper margin, soon becoming convex and swollen-uneven, immarginate. Epithecium dense green-black, granular, 8-13 µm thick. Hymenium colourless, or very pale greenish, to 45 µm tall. Hypothecium massive, black, heavily carbonised. Ascospores broadly ellipsoid to subglobose, 10.2-12 × 6.8-8.3 µm.