Thallus pale to dark grey-brown or dark brown, often with a purplish tinge, thin and continuous or ± incompletely rimose-cracked; areoles to 0.7 mm diam., often smaller, irregular, flat. Prothallus dark brown to black, thin. Anamorph: no information available. Teleomorph: ascomata apothecia, 0.2-0.6 mm diam., emergent to adpressed, sessile, black, rounded. Disc flat to markedly convex. True exciple at first thin, soon occluded, usually indistinct. Ascospores 5-9.5 × 5-6.5 μm, spherical to broadly ellipsoidal. Chemistry: lichen products not detected by TLC.