Thallus: basal squamules dominant, elongate, 0.5-2 cm long, ± erect, with indented margins, mostly contiguous and forming ± compact interlocking cushions; upper surface bluish or lead-grey; lower surface white, usually ± blackened towards base. Podetia to 1.5 cm tall, rather rare, with irregular or deformed turgid scyphi, flared from the base, bearing squamules, often irregularly proliferating from the rim. Anamorph: conidiomata pycnidia dark brown, on rim of scyphi. Teleomorph: ascomata apothecia, small, dark brown, on rim of scyphi, usually ± becoming clustered, rather frequent. Chemistry: thallus C–, K+ yellow, KC–, Pd+ red, UV– (fumarprotocetraric acid, atranorin).