Thallus orbicular to spreading, loosely attached, 5-15 cm diam., corticolous or saxicolous. Lobes rounded, 10-15 mm wide, margins crenate, sinuous, sparsely ciliate, cilia 1-1.5 mm long. Upper surface pale greenish-yellow to greyish, shining, distinctly white-maculate (×10 lens) becoming irregularly cracked with age, moderately to densely isidiate. Isidia small, terete, simple to branched, to 1 mm tall, rarely ciliate. Lower surface pale brown, rarely darkening centrally, with a wide, pale brown, papillate, naked marginal zone. Rhizines black, simple, frequent, central. Apothecia not seen. Chemistry: Cortex K+ yellow; medulla K+, C-, KC+ pink, Pd+ orange. Salazinic acid, norlobaridone and atranorin.