Thallus pale greyish-fawn or whitish, smooth, continuous or eroded or ± rimose in parts, often in small ± granular patches or ± lacking, delimited by a thin, black, marginal prothallus. Apothecia 0.2-1.2 mm diam., solitary or crowded, rounded to irregular-deformed through mutual pressure, disc plane to subconvex, black, epruinose, matt, margins entire, raised, persistent at first, excluded at maturity. Epithecium olive-black. Hymenium 100-145 µm tall. Hypothecium brown-black. Excipulum well-developed, interior partly carbonised. Ascospores ellipsoid, apices rather pointed, 16-33 × 7-13 µm. Chemistry: Stictic, norstictic, ?psoromic acids.

Thallus greyish-brown or olivaceous, continuous to ± eroded or lacking, or squamulose-areolate, areolae plane to ± convex, often lifting from substrate, 1-5 cm diam. Apothecia numerous, scattered, small, 0.1-0.8 mm diam., solitary to 2-3-confluent, disc black, matt, epruinose, plane and marginate becoming convex and immarginate. Epithecium dense, black, granular, 8-10 µm thick. Hymenium pale straw-coloured, 17-25 µm tall. Hypothecium pale yellow-brown, 35 µm thick. Ascospores ellipsoid, 12.0-17.4(-22) × 5.1-8.7 µm.