Thallus foliose, lobate, heteromerous, dorsiventral, ± orbicular to spreading, corticolous, loosely attached, without a prothallus. Lobes undulate, adjacent, cuneate or flabellate, often imbricate or dissected, to 6 mm wide, margins incised or variously notched and dissected or ± sublobulate or phyllidiate-lacerate or sorediate and ± sinuous, ascending. Upper surface dark bluish-green to grey-green when wet, pale grey-blue when dry, undulate, minutely roughened-scabrid to coarsely areolate-scabrid, with or without soredia, without maculae, isidia or pseudocyphellae. Photobiont blue-green, . Upper cortex of 2-3 layers of ± isodiametric cells with hyphae perpendicular to upper surface. Lower cortex absent, Medulla white, of loosely woven, branching hyphae. Lower surface pale, occasionally bluish or greenish-black, ± densely rhizinate. Rhizines pale or blue-green, complex, entangled, to 3 mm long. Apothecia biatorine, proper margin pale, disc pale red-brown or pinkish to dark brown or blackened, matt, epruinose, never gyrose-contorted, scattered, laminal, sessile or subpedicellate. Ascospores 8 per ascus, colourless, ellipsoid, simple, uniseriate.