Thallus loosely attached, 4-15 cm diam., spreading or ± orbicular. Lobes very variable, broad and rounded to laciniate, lacerate, margins entire or slightly notched, incised, granular-isidiate, wavy to dissected. Isidia short, ± terete, granular becoming coralloid, often clustered, mainly marginal and there often dense, occasionally in clusters on upper surface along cracks or fissures. Upper surface greyish-brown to dark reddish-brown, smooth, matt, wrinkled or shallowly faveolate, rarely granular-isidiate. Lower surface pale brown to dark red- brown or ± blackened, with a dense, uniform, tangled, felt-like tomentum to margins. Cyphellae scattered to numerous, large, to 2 mm diam., white, rarely yellow-brown or reddish-brown, with a prominent, dark, raised rim. Apothecia not seen in New Zealand material.