Thallus 3-10(-20) cm long, at first ± erect, sometimes becoming ± pendulous. Main branches to 1.5 mm diam., often rather straight, irregularly branched with few to abundant fibrils to 1 cm long arising at right angles from the branches. Surface reddish brown at least in the basal region, above often ± green-grey with ± numerous red-brown flecks. Thallus trunk with some blackening at the extreme base, and some annellations. Branches often irregularly articulate, but segments not conspicuously inflated. Tubercles abundant and conspicuous on main branches, often eroded at apices forming small punctiform soralia with coarsely granular soredia which are sometimes intermixed with secondarily corticate isidiomorphs. Papillae rather frequent on main branches but absent on fibrils. Cortex robust but not very thick, medulla often thin, axis thick, pigmentation only in the cortical layer.
Anamorph: not known.
Teleomorph: not known.
Chemistry: two chemotypes occur: (a) C–, K+ yellow-red, KC–, Pd+ orange (usnic, stictic, constictic and ± norstictic and psoromic acids); (b) C–, K+ yellow→red, KC–, Pd+ orange (usnic, salazinic and ± norstictic acid).