Thallus suborbicular to spreading, 3-6 cm diam., closely appressed, corticolous. Lobes dichotomously to irregularly divided, 1-2 mm wide, contiguous, apices rounded, flabellate, scarcely distinctly discrete at periphery, usually confluent from margins, upper surface glaucous-white, or yellowish glaucous-grey to grey, moderately to densely pruinose, sorediate, longitudinally plicate-rugose centrally, becoming subverrucose, or subcrustose. Soralia laminal, on convex parts of plicate thallus, globose-capitate 0.5-1 mm diam., discrete, or dense and confluent, sorediafine, farinose, rarely granular, white. Lower surface black. Apothecia infrequent, laminal, sessile to subpedicellate, 0.6-2 mm diam., disc black, epruinose or subpruinose, margins, thick, entire concolorous with thallus. Ascospores biseriate, 12-22 × 6-10 µm. Chemistry: Cortex K+ yellow; medulla K-, C-, Pd-. Atranorin and divaricatic acid.