Thallus heteromerous, foliose, dorsiventral, rosette-forming to irregularly spreading, closely attached. Upper surface paraplectenchymatous, of anticlinal hyphae, white, greyish-green, grey to brownish-grey, pruina, pseudocyphellae, soredia and isidia present or absent. Medulla white, pale straw-coloured to deep ochraceous-orange (pigments K+; purple). Photobiont green ?. Lower surface corticate, of longitudinally arranged hyphae forming a prosoplectenchymatous tissue, dark brown or black, rhizinate. Rhizines black, simple, often with an anchoring, squarrose tuft at tip. Apothecia lecanorine, appearing lecideine, thalline exciple often not well-developed. Epithecium and tips of paraphyses K+ purple. Hypothecium brown. Asci of -type, 8-spored. Ascospores 1-septate, brown, thick-walled of - or -type.