Thallus usually less than 5 cm tall, ± erect, tufted, main branches 1-1.5 mm diam., strongly inflated, markedly articulate and constricted at point of attachment, richly branched with frequent fibrils ± attached at right angles, the small branches often recurved due to extensive development of soralia on one side. Surface pale grey-yellow, becoming deep brown in the herbarium, not blackened at the base. Cortex smooth, shiny throughout, almost always without distinct papillae or tubercles. Soralia conspicuous, usually exceeding the width of the branch, mostly erumpent, convex-globular, coarsely granular, whitish, mainly situated towards apices. Isidiomorphs absent. Medulla very lax, axis thin.
Anamorph: not known.
Teleomorph: not known.
Chemistry: thallus C–, K–, KC–, Pd+ red (fumarprotocetraric and ± protocetraric acids).