Thallus placodioid, forming large, closely-appressed, partially or entirely rounded thalli to 12 cm across, usually zoned or piebald with white pruina. Lobe-ends rounded and flat, sometimes with shallow folds but without distinct furrows, bright orange-yellow, older parts frequently paler or white due to loss of pigment. Central area cracked-areolate, in part brown-orange due to the presence of apothecia. Isidia and soralia absent. Photobiont trebouxioid. Anamorph: no information available. Teleomorph: ascomata apothecia, 1-1.5 mm diam., confined to the central area of the thallus, usually abundant and crowded, flat with a distinct orange-yellow thalline margin, often becoming convex and immarginate when old. Disc orange-brown, deeper coloured in thalli growing in strong light. Epithecium with copious yellow-brown crystals, hymenium and hypothecium hyaline. Interascal tissue of paraphyses 1-2 μm diam., slender and straight, septate, not or only slightly swollen at the apices. Asci clavate, 8-spored. Ascospores 10-13 × 8-10 μm, strongly swollen at the septum, typically lemon-shaped to broadly rhomboid, the septum variable in width, to 5 μm wide; hyaline, smooth and thick-walled, without an epispore, gelatinous sheath or appendages. Chemistry: thallus and apothecia K+ purple.