Thallus foliose, lobate, dorsiventral, heteromerous, corticolous. Lobes rather small, irregularly to subdichotomously branching, often imbricate. Upper surface convex, yellowish-green to yellow (usnic acid in upper cortex). Medulla white, loosely woven. Lower surface corticate, between conspicuous, rounded, moniliform, patches of thick, brown or black hypothallus. Rhizines few, thick, simple, with an anchoring tuft at apex, brown or black. Apothecia sessile or subpedicellate, disc plane to concave, imperforate, reddish-brown, with a conspicuous thalline margin, concolorous with thallus. Ascospores spherical, thick-walled, colourless, 8 per ascus. Chemistry: Divaricatic and usnic acids.