Thallus small-foliose, lobate, dorsiventral, heteromerous, attached to substrate by clumps of rhizines. Upper surface ± hairy or tomentose, the tomentum white or yellowish or brownish-buff. Photobiont blue-green, . Lower surface white or yellowish-brown, strongly tomentose. Rhizines black, often in thick separate clumps or tufts. Apothecia ± marginal, sessile or subpedicellate with a well-defined thalline margin and exciple. Ascospores 8 per ascus, colourless, simple, ellipsoid or elongate-fusiform. Pycnidia marginal, brown or black. Conidia of -type, septate, short, cylindrical.