Thallus: podetia 4-10 cm tall, grey-green often with a yellowish green tinge, the surface often roughened, areolate particularly towards the base, richly branched. Terminal branches mostly ± erect, not orientated in one direction, forming broccoli-like, rounded heads, the branching predominantly trichotomous at apices, often with perforated axils. Anamorph: conidiomata pycnidia. Pycnidial jelly hyaline. Teleomorph: not known. Chemistry: thallus C–, K–, KC± yellow, Pd–, UV+ pale blue (perlatolic and usually usnic acid).