Thallus orbicular to spreading, ± entangled, to 18 cm diam., loosely to closely attached. Lobes linear-elongate (3-)5-8(-14) mm wide, 1.5-6.0 cm long, ± subcanaliculate, subdichotomously branched, discrete, margins entire, sinuous, slightly thickened below, faintly white-pubescent towards apices. Upper surface dark greyish-blue to blue-green, tinged brownish at margins when wet, pale greyish-fawn when dry, minutely scabrid, coriaceous, uneven or very slightly wrinkled-undulate, without isidia, soredia or pseudocyphellae. Medulla white. Photobiont blue-green. Lower surface densely tomentose to margins, occasionally naked centrally, pale buff at margins, dark brown to black centrally, tomentum thick, silky, pale whitish to dark brown, occasionally in scattered, squarrose tufts. Pseudocyphellae white, scattered, conspicuous, round to irregular, 0.5-2.5 mm wide, plane to concave, with a raised margin at maturity, often sunk in tomentum. Apothecia not seen. Pycnidia sparse to frequent, immersed, 1.5 mm diam., visible as hemispherical swellings on lower surface. Chemistry: 7β-acetoxyhopan-22-ol and hopane-15α, 22-diol.