Global occurrence: Africa (incl Madagascar) | Eurasia – Europe | Arctic. Substrate: bark, cork, plant surface – trunks, branches, twigs | rock – siliceous, siliciferous, acidic | rock, stones, pebbles – unspecified. Life habit: lichenized (mutualistic with algal photobionts). Thallus: fruticose (fruticous), shrub-like, beard-like; continuous, diffuse, effuse; [th] upper surface: grey(ish) green; [th marginal and upper surface] specific structures: present; [th margin] cilia, cilioid structures: absent; [th upper surface] isidia, isidioid structures: absent; [th upper surface] soredia, soralia, soralioid structures: present; [th] morphol substructures (eg areoles, lobes, branches) width [mm]: (low) 1.0 (high) 3.0. Ascomata: absent. Secondary metabolites: absent | present, usnic acid. Primary photobiont: present, chlorophytaceous – trebouxiaceous, chlorococcoid. Secondary photobionts (eg in cephalodia): absent.