Thallus orbicular to irregularly spreading, 5-20(-30) cm diam., loosely attached. Lobes numerous, rounded to elongate-laciniate, very variable, 1-1.5(-2.5) cm wide and 2-3(-5) cm long, margins entire, ± sinuous or slightly notched, not phyllidiate, often subascendent, with punctate, yellow pseudocyphellae, sometimes ± canaliculate, rarely plane. Upper surface bright lettuce green, glaucous-green or pale yellowish-green when wet, pale yellowish-grey when dry becoming ochre-brown on storage, undulate or shallowly reticulate-faveolate, interconnecting ridges low, rounded, smooth, matt or shining, sometimes ± areolate-scabrid at or near lobe apices, minutely maculate (×10 lens). Medulla yellow. Photobiont green. Lower surface irregularly wrinkled, pale yellowish to ochre-brown at margins, dark red-brown to blackened centrally, often glabrous to sparsely or patchily tomentose to margins, tomentum silky, pale grey or whitish to medium brown, often ± tufted or ragged. Pseudocyphellae scattered, inconspicuous, sparse to numerous, punctiform, 0.5-1.5 mm diam., low-conical, decorticate area yellow. Apothecia sparse, often absent from well-developed thalli, sessile to subpedicellate, laminal, rarely marginal, 3-5(-10) mm diam., disc not fully exposed until late in development, partly obscured at first by inflexed, scabrid-verrucose exciple, disc red-brown, finely rugose, shining, subconcave to plane, thalline exciple conspicuous, persistent, pale whitish to buff, translucent when wet, very coarsely verrucose-areolate-scabrid. Epithecium granular, pale yellowish-brown, 13-22 µm tall. Hymenium colourless, 80-110 µm tall. Hypothecium c. 100 µm thick, pale yellowish-brown. Paraphyses conglutinate, simple, filiform, 1.5 µm thick, apices swollen to 5 µm thick, yellow-brown. Asci clavate 70-90 × 10-22 µm. Ascospores biseriate, ellipsoid-fusiform, apices pointed, straight or slightly curved, colourless, 1-3septate, 3-septate at maturity, (20-)25-34(-39) × 6.8-8.3 µm. Chemistry: Pulvinic dilactone, pulvinic acid, calycin, stictane-3β,22αdiol (±), 22α-hydroxy3,4,secostict-4(23)-ene-oic acid, 22α,hydroxy-3,4-secostict-4(23)-en-3-ol (±), 3acetoxy-3,4-secostict-4(23)-en-22α-ol (±). See Goh et. al., (loc. cit.).