Thallus heteromerous, foliose, dorsiventral, lobate, often irregularly laciniate or polyphyllous, corticolous, rarely saxicolous. Lobes rounded to ± linear-laciniate, margins entire or dissected-phyllidiate or sorediate. Upper surface smooth or wrinkled or faveolate-impressed, with or without soredia, isidia or phyllidia, lacking pseudocyphellae. Medulla white. Photobiont green, , or blue-green, or . In those species having a green photobiont, internal and external cephalodia containing a blue-green alga are normally present. Lower surface glabrous, smooth or wrinkled-bullate, ± tomentose without cyphellae or pseu-docyphellae. Rhizines simple to squarrose, sparse to frequent, to 5 mm long, concolorous with lower surface or paler. Apothecia hemiangiocarpic, subpedicellate, laminal, lecanorine, disc red-brown, imperforate. Paraphyses thread-like, septate. Asci cylindrical, clavate. Ascospores 8 per ascus, colourless or brown, fusiform or linear-acicular at maturity, 3-7-septate. Pycnidia frequent, minute, immersed, ostiole punctiform, black or dark red-brown. Conidia rod-shaped.