Thallus orbicular to spreading, rather irregular, 5-10(-20) cm diam., ± closely attached to loosely straggling. Lobes broad, rounded, to rather ragged, imbricate centrally, contiguous to subimbricate at apices, margins crisped, variously notched or incised, isidiate. Upper surface bright green to yellow green when wet, pale yellowish-grey when dry, undulate, uneven, slightly and shallowly faveolate, shining, smooth, ± isidiate. Isidia flattened, coralloid-branched, marginal at first, then laminal, often dense. Medulla yellow. Photobiont green. Lower surface pale yellowish or creamish at margins, glabrous or minutely pubescent, darker yellow to brownish centrally. Pseudocyphellae yellow. Apothecia sparse to absent, subpedicellate, disc brown-black, matt, smooth, to 5 mm diam., concave to plane, margins pale or whitish, translucent when wet, crenulate-dentate, thalline exciple massive, white, corrugate-verrucose, obscuring disc when young, often ± short white-tomentose. Ascospores colourless, fusiform, 1-3-septate, 24-30 × 5-7 µm. Chemistry: Pulvinic acid, pulvinic dilactone, calycin, 3β,22α,-diacetoxystictane (±), 2α,3β,22α, triacetoxystictane, 2α,3β-diacetoxystictane-22-one (±), 2α,3β-diacetoxys-tictan-22-ol (±), 3β-acetoxystictane-22-ol (±), stictane-3 β,22α,-diol (±),2α -acetoxystictane-3β,22α,-diol, 3β-acetoxystictane-2α,22α,-diol, stictane-2β,3β,22α-triol (±) [Chin et al., J. chem. Soc. Perkin 1: 1437-1446 (1973)].