Global occurrence: Oceania – Australasia | Eurasia – Europe | Americas – North America (incl Mexico) | Arctic. Life habit: lichenized (mutualistic with algal photobionts). Thallus: filamentose (filamentous), pannose; [th] upper surface: black(ish) | black(ish) brown; [th marginal and upper surface] specific structures: absent. Ascomata: absent. Secondary metabolites: absent. Primary photobiont: present, chlorophytaceous – trentepohliaceous, trentepohlioid. Secondary photobionts (eg in cephalodia): absent.