Thallus foliose, heteromerous, lobate, dorsiventral, greenish-grey or whitish-grey to dark grey, sometimes with a whitish pruina, corticolous or saxicolous. Lobes closely attached, to ± ascending, irregularly or dichotomously branched. Upper surface plane or convex, white-maculate or emaculate, with or without soredia, upper cortex paraplectenchymatous or composed of hyphae ± parallel to the surface. Photobiont green, . Lower surface white to pale brown with whitish to dark brown rhizines. Apothecia laminal, lecanorine, sessile or subpedicellate, thalline exciple persistent, concolorous with thallus, disc dark brown to black sometimes with a white pruina, retrorse hairs absent or present at base of apothecia. Ascospores 8 per ascus, 2-celled, thick-walled, dark brown. Atranorin is a constant chemical constituent and often also zeorin.