Thallus orbicular, rosette-forming to spreading, 6-10(-16) cm wide, loosely attached, lobes short, rounded, 0.3-0.8 mm broad, imbricate or contiguous, margins entire, sinuous, shallowly incised, often subascendent, densely white- tomentose. Upper surface dark, livid, leaden-grey when wet, pale brownish- grey or pinkish-fawn when dry, ± uniformly thickly tomentose, tomentum long, white, silky, cortex below tomentum, smooth, undulate, uneven, shining, never scabrid. Medulla white. Photobiont blue-green. Lower surface pale brownish or whitish at margins, dark brown centrally, irregularly ridged or wrinkled-faveolate towards margins, ± uniformly tomentose, tomentum thick, whitish, silky, uneven, often developing in long, tufted fascicles towards margins. Pseudocyphellae yellow, tiny, 0.1-0.3 mm diam., scattered or frequent, sunk in tomentum. Apothecia not seen. Pycnidia not seen. Chemistry: Tenuiorin, methyl gyrophorate (±), methyl lecanorate, pulvinic dilactone, pulvinic acid, calycin, norstictic and stictic acid and constictic acids, hopane-15α-22-diol, hopane-6α,7β,22-triol.