Thallus foliose, dorsiventral, heteromerous, laciniate. Lobes narrow, rather small, deeply divided and often somewhat articulated, flat to ± convex, with or without isidia, with or without soredia. Medulla white, with or without a central chondroid strand. Photobiont green, ?. Lower surface composed of a prominent, brown-black, spongy hypothallus, ± rhizinate. Rhizines stout, simple or sparingly branched, anchored to substrate by an apical, squarrose tuft. Apothecia laminal, sessile or subpedicellate, lecanorine. Asci with a large amyloid tholus. Ascospores numerous, simple, colourless, curved.