Thallus unattached, 5-10 mm diam., when dry, 10-35 mm diam., when wet. Lobes convex, 2-3 mm wide, dichotomously branched, margins entire, apices rounded, brown-tipped, curling inwards when dry, the thallus then becoming ± spherical. Upper surface greenish-yellow, smooth, often shining and faintly maculate (× 10 lens), isidia, pseudo-cyphellae and soredia absent. Medulla white. Lower surface pale yellow, minutely wrinkled. Rhizines absent. Apothecia rare, sessile or subpedicellate, laminal or submarginal, 0.5-2.5 mm diam., disc concave, reddish-brown, matt, smooth, margins thick, crenulate or minutely fissured, concolorous with thallus, thalline exciple smooth. Ascospores ellipsoid, 10 × 5 µm. Chemistry: Cortex K-, medulla K+ red-brown, C-, KC-, Pd+ red. Fumarprotocetraric, succinprotocetraric and usnic acids.