Thallus rather delicate, often rosette-forming, closely attached to 4 cm diam., corticolous. Lobes dichotomously to irregularly branched, often imbricate, 1-2.5 mm wide. Upper surface plane or ± convex, whitish-grey to pale greenish-grey, occasionally white-maculate, without pruina,sorediate. Soralia laminal, capitate to crateriform, soredia granular, rather coarse, white to pale greenish-white in shaded situations. Lower surface pale, rhizinate. Rhizines pale, sparse, short. Apothecia rare, central, sessile to subpedicellate, to 1 mm diam., disc dark brown, densely grey-pruinose, margins thick, entire, concolorous with thallus. Ascospores 18-21 × 7-9 µm. Chemistry: Cortex and medulla K+ yellow. Atranorin, leucotylin, zeorin and two unidentified compounds.