Thallus foliose, distinctly dorsiventral, 1 - 10 cm broad. Lobes rounded, margins entire, often slightly raised. Upper surface greenish-brown when wet, red- brown when dry, rather scabrid. Photobiont rather discontinuous below upper cortex. Cephalodia internal in ± ovoid colonies above lower surface. Medulla orange (solorinic acid, K+ purple). Lower surface bright orange (solorinic acid), tomentose with a reticulum of brown veins often present. Apothecia oblong to round, plane, not depressed into thallus, disc dark brown, to 1 cm diam. Asci 6-8-spored. Ascospores 1-septate, oblong-ellipsoid, hyaline, becoming brown, 25-45 × 10-12 µm. Chemistry: Thallus and medulla K+ purple. Solorinic acid.