Thallus homoiomerous, lobate, subcrustose, foliose to ± fruticose, subgelatinous, ± transparent, opaque, pliable when wet, except for a few species not noticeably swelling when wet, wrinkled, papery when dry, corticolous or saxicolous. Lobes flattened, orbicular to elongate, to crowded-congested and ± subascendent, margins entire or lacerate-crenulate or isidiate, upper surface smooth, undulate or wrinkled-plicate or lobulate or isidiate, soredia absent, lead-grey to bluish or greenish or livid brownish at margins, rarely completely red-brown or brown. Cortex of a single layer of irregularly isodiametric cells on both upper and lower surfaces. Photobiont blue-green, , randomly distributed as scattered chains throughout thallus. Lower surface smooth or wrinkled, glabrous or tomentose. Apothecia emergent, adnate, sessile or shortly pedicellate, laminal or occasionally marginal, disc pink to red-brown or black, epruinose, both thalline and proper exciples normally present, thalline exciple sometimes lobulate. Ascospores (4-)8 per ascus, fusiform-ellipsoid to oblong-fusiform, ± submuriform with 2-11 transverse septa and 1-2(-10) longitudinal septa, apices rounded or pointed.