Thallus crustose, thin, uniform. Photobiont green, . Apothecia lecideine, sessile, round to irregular, black or dark brown, proper margin thick, persistent, or occluded at maturity. Excipulum radiate, of moderately thickened hyphae. Hymenium I+ dark blue 80-170 µm tall. Paraphyses abundant, simple or branched-anastomosing and capitate at apices. Hypothecium pale, to dark blue-black. Asci clavate to cylindrical with an amyloid tholus. Ascospores 8, rarely 12-14 per ascus, 1-septate, colourless, ellipsoid, moderately thick-walled, slightly constricted at septum.