Thallus chalk-white to pale grey or brownish, of circular, rounded areoles 0.2-1.2(-1.8) mm diam., mostly scattered but sometimes becoming crowded and angular, matt, often convex, sometimes with darker margins. Prothallus white to pale grey, effuse, visible between areoles but indistinct at the perimeter. Anamorph: no information available. Teleomorph: ascomata apothecia, 0.2-0.6(-0.8) mm diam., mostly one per areole, often occupying the entire areole. Epithecium olive, K+ yellow-orange, N+ green. Asci 4-spored. Ascospores ca 20 × 11 μm, ellipsoidal, aseptate, hyaline, thin- and smooth-walled, without a gelatinous sheath or epispore. Chemistry: thallus K–, Pd–, no lichen substances detected.