Thallus 2-5(-10) cm tall, ± erect, forming often dense, shrubby tufts, main branches to 1 mm diam., often curved, often with a few inconspicuous annulations. Branching irregular, thinner branches often contorted, surface grey-green, blackened at the base. Main stems covered with low, inconspicuous dense papillae and numerous fibrils to 10 mm long, mostly arising at right angles from the branches and becoming curved.
Anamorph: not known.
Teleomorph: ascomata apothecia, frequent, arising at apices of main and major lateral branches; disc 5-10 mm diam., at first ± concave, becoming flat, smooth or wrinkled, with abundant, often branched, marginal projections to 5 mm long. Ascospores 8.5-11 × 5.5-7 μm, ellipsoidal.
Chemistry: Medulla C–, K+ yellow, KC–, Pd+ orange (thamnolic and alectorialic acids, the latter especially in the apothecia).