Thallus thin, smooth or finely rimose-cracked, sometimes delimited by a dark prothallus and mosaic-forming, dull olive to red-brown, rarely grey, often with a white-dotted appearance due to accumulations of crystals. Anamorph: conidia pycnidia, immersed in the thallus, visible as black dots. Conidia 4-8 × 0.8-2 μm, variable, straight or curved. Teleomorph: ascomata lirellate apothecia, (0.25-) 0.32-0.5 (-1) × 0.09-0.15 (-0.3) mm, immersed, sometimes elevated on a thalline cushion, curved or substellate, usually numerous and often contiguous. Disc ± fully exposed, surrounded by a very thin exciple (K–) and sometimes a thin, persistent, whitish, raised, pseudothalline exciple. Epithecium brown. Hymenium 50-60 μm tall, K–. Ascospores (15-) 17-27 × 3-5 μm, fusiform, often curved, 3-septate, quite thick-walled, smooth, becoming brown when over-mature. Chemistry: thallus C–, K–, KC–, Pd–, UV– (no lichen products detected by TLC).