Thallus fruticose, erect or pendulous, heteromerous, tissues radially arranged, branching subdichotomous to irregular, attached to substrate by a holdfast, branches usually flattened, rarely terete or angular-terete, corticate, cortex variable in structure, mechanical tissue usually below cortex either in a continuous zone or net or broken up into strands of longitudinal thick-walled hyphae. Photobiont green, . Medulla white, loosely woven, usually filling the interior, in some species the medulla is reduced to a layer below the algae and a ± hollow cavity results. Apothecia short stipitate, terminal or lateral, peltate or cup-shaped, lecanorine, disc matt, yellowish, ochraceous or pale flesh-coloured and often white- or pink-pruinose. Ascospores colourless, long, ellipsoid, straight or curved, 1-septate. Pycnidia with black or hyaline walls, minute, laminal or subterminal. Conidia uniform, cylindrical-elongate 3-5 × 1-2 µm.