Global occurrence: Eurasia – Europe | Arctic. Substrate: rock – calcareous, calciferous, basic | rock, stones, pebbles – unspecified. Life habit: lichenized (mutualistic with algal photobionts). Thallus: crustose (crustaceous) – endosubstratal, inconspicuous, immersed | crustose (crustaceous) – episubstratal – unspecified; thallus: continuous, diffuse, effuse | granular, granulose, granulate; [th] upper surface: grey(ish) | white(ish) grey; [th marginal and upper surface] specific structures: absent. Ascomata: absent | present; ascoma: perithecial, perithecioid – hymenial; ascoma [mm]: (min) 0.3 (low) 0.5 (high) 0.6 (max) 1.0; 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: (low) 6.0 (high) 8.0; [asp] shape: ellipsoidal; [asp] length [µm]: (min) 20.0 (low) 25.5(median) 27.2 (high) 29.0 (max) 30.0; [asp] width [µm]: (min) 12.5 (low) 14.2(median) 16.0 (high) 17.0 (max) 22.0; [asp] septa: present;[asp] septa: muriformly septate – muriform, submuriform; [asp] transversal septa: (low) 3.0 (high) 7.0; [asp] pigmentation: hyaline, colourless. Secondary metabolites: absent. Primary photobiont: present, chlorophytaceous – trebouxiaceous, chlorococcoid. Secondary photobionts (eg in cephalodia): absent.