Thallus orbicular to spreading often ± pendulous, 8-20(-30) cm diam. Lobes rounded to linear-enlongate, 10-25 mm wide, to 12 cm long, ± irregularly incised, margins often notched or crenulate, ± ragged or with coarse to verruciform-granular to flattened isidia. Upper surface bright green or yellowish-green or tinged pale bluish-green when wet, pale greenish-grey when dry, slightly undulate to very shallowly faveolate, matt or glossy, minutely scabrid-areolate (×10 lens), occasionally cracked, lacerate, isidiate. Isidia coarse, verruciform-granular or subcoralloid, abraded at apices and exposing yellow, medulla, appearing ± sorediate, marginal and laminal. Medulla yellow. Photobiont green. Lower surface thinly white-tomentose, ± bullate, pale yellowish-buff. Cephalodia in prominent rounded warts. Pseudocyphellae numerous, yellow, crowded, raised in verrucae, 0.1-0.2 mm diam. Apothecia sparse to frequent, 2-10 mm diam., pedicellate, laminal, rarely marginal, disc red-brown, concave to plane, matt, often fissured, with eroded, verruciform-isidiate margins, thalline exciple prominent, pale, verrucose-areolate. Ascospores 1-3-septate, colourless, fusiform-ellipsoid (30-)34-40 × 8-11 µm. Chemistry: Pulvinic dilactone, pulvinic acid, calycin, polyporic acid, 2α,3β,22α-triacetoxystictane, 22α,hydroxystictane-3-one (±), 2α-3β-diacetoxystictane-22α-ol, stictane-3β,22αdiol (±), 2α-acetoxystictane-3β,22,α-diol, 3β-acetoxystictane-2α,22α-diol (±), stictane-2α,3β,22α,-triol (±).