Thallus white to greyish-blue-white, soft, felted, in fine strands, 0.2-0.4 mm thick and 4-8 mm tall, and to 10(-15) cm diam., orbicular or irregularly spreading, without soredia or isidia, corticolous, or muscicolous. Apothecia emergent, lateral and terminal on strands, frequent to absent, subpedicellate, subglobose, disc concave to plane or subconvex, black or brown-black, distinctly white-tomentose, 0.5-1(-2) mm diam. Ascospores fusiform with pointed ends, 5-septate, locules rounded, slightly curved 22-30(-34) × 3-8 µm. Chemistry: Lepraric acid.