Global occurrence: Eurasia – Europe | Arctic. Substrate: rock – siliceous, siliciferous, acidic. Life habit: lichenized (mutualistic with algal photobionts). Thallus: crustose (crustaceous) – episubstratal – unspecified; cracked, fissured, fractured, rimose; [th] upper surface: grey(ish) | brown(ish) grey; [th marginal and upper surface] specific structures: absent; [th] morphol substructures (eg areoles, lobes, branches) upper surface: cracked, fissured, fractured, rimulose, subrimose | uneven, undulate. Ascomata: absent | present; ascoma: perithecial, perithecioid – hymenial; ascoma [mm]: (low) 0.3 (high) 0.5 (max) 0.7; ascoma: subsessile, subimmersed, adnate, semi-immersed, emergent; [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: black(ish); [ascm] paraphyses/-oids: absent. Asci: fissitunicate – verrucarialean; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): absent. Ascospores: (median) 8.0; [asp] shape: ellipsoidal | clavate; [asp] length [µm]: (low) 30.0 (high) 45.0 (max) 68.0; [asp] width [µm]: (low) 15.0 (high) 20.0; [asp] septa: present; muriformly septate – muriform, submuriform; [asp] transversal septa: (low) 3.0 (high) 5.0; [asp] pigmentation: hyaline, colourless; [asp] perispore, epispore: not apparent. Secondary metabolites: absent. Primary photobiont: present, chlorophytaceous – trebouxiaceous, chlorococcoid. Secondary photobionts (eg in cephalodia): absent.