Global occurrence: Eurasia – Europe | Americas – North America (incl Mexico) | Arctic. Substrate: rock – siliceous, siliciferous, acidic | rock, stones, pebbles – unspecified. Life habit: lichenized (mutualistic with algal photobionts). Thallus: crustose (crustaceous) – episubstratal – unspecified; thallus: compartimentized – areolate, squamulate; [th] upper surface: blue(ish) grey | grey(ish) blue; [th marginal and upper surface] specific structures: absent | present; [th margin] cilia, cilioid structures: absent; [th upper surface] isidia, isidioid structures: absent | present; [th upper surface] soredia, soralia, soralioid structures: absent | present; [th] morphol substructures (eg areoles, lobes, branches) upper surface: granulose, granular. Ascomata: absent | present; ascoma: apothecial, apothecioid – hymenial; ascoma [mm]: (low) 0.3 (high) 1.0; ascoma: immersed, innate | subsessile, subimmersed, adnate, semi-immersed, emergent; [ascm] paraphyses/-oids: present. Asci: lecanoralean; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): absent. Ascospores: (min) 4.0(median) 8.0; [asp] shape: subglobose, subspherical | ellipsoidal; [asp] length [µm]: (low) 14.0 (high) 30.0; [asp] width [µm]: (low) 7.0 (high) 16.0; [asp] septa: absent – spore lumen unilocular, monolocular; [asp] pigmentation: hyaline, colourless. Secondary metabolites: present, aspicilin. Primary photobiont: present, chlorophytaceous – trebouxiaceous, chlorococcoid. Secondary photobionts (eg in cephalodia): absent.