Thallus foliose, lobate, heteromerous. Lobes rounded 0.3-1.5 cm broad, rarely sublinear, canaliculate, 0.2-0.3 cm broad, margins entire, often sinuous and ± ascending, without cilia. Upper surface uniformly grey, grey-green or ± olivaceous-grey, with or without isidia, with or without soralia, pseudocyphellate, pseudocyphellae, suborbicular, without a perforate, polysaccharide covering, scattered, not arranged in lines or in a ridged reticulum. Photobiont green, . Medulla white. Lower surface pale tan or whitish, brown or black, rhizinate. Rhizines simple, often not reaching lobe margins. Apothecia laminal or submarginal, disc entire, rarely perforate. Ascospores ellipsoid, colourless, simple, 8 per ascus, 10-27 × (5-)8-18 µm. Pycnidia laminal or rarely marginal. Conidia unciform, or filiform, or bifusiform.