Global occurrence: Oceania – Australasia | Eurasia – Europe | Americas – North America (incl Mexico) | Americas – South and Central America | Arctic. Substrate: rock, stones, pebbles – unspecified. Life habit: lichenized (mutualistic with algal photobionts). Thallus: fruticose (fruticous), shrub-like, beard-like; thallus: continuous, diffuse, effuse; [th] upper surface: black(ish) | green(ish) brown (olive brown); [th upper surface]: epruinose; [th marginal and upper surface] specific structures: absent; [th] morphol substructures (eg areoles, lobes, branches) width [mm]: (min) 0.3. Ascomata: absent | present; ascoma: apothecial, apothecioid – hymenial; ascoma [mm]: (min) 0.5; ascoma: immersed, innate; [ascm] paraphyses/-oids: present. Asci: prototunicate; [asc] tholus: not thickened. Ascospores: (median) 8.0; [asp] shape: ellipsoidal; [asp] length [µm]: (low) 12.0 (high) 18.0; [asp] width [µm]: (low) 10.0 (high) 15.0; [asp] septa: absent – spore lumen unilocular, monolocular; [asp] pigmentation: hyaline, colourless. Secondary metabolites: absent. Primary photobiont: present, cyanobacterial. Secondary photobionts (eg in cephalodia): absent.