Global occurrence: Eurasia – Europe | Arctic. Substrate: rock – calcareous, calciferous, basic. Life habit: lichenized (mutualistic with algal photobionts); [th] upper surface: white(ish) | red(dish) white (pink); [th marginal and upper surface] specific structures: absent. Ascomata: absent | present; ascoma: apothecial, apothecioid – hymenial; ascoma [mm]: (median) 0.3. Asci: unitunicate; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): absent | present. Ascospores: (median) 8.0; [asp] shape: subglobose, subspherical | broadly ellipsoidal; [asp] length [µm]: (low) 10.0 (high) 16.0; [asp] width [µm]: (low) 6.0 (high) 10.0; [asp] septa: present, muriformly septate – muriform, submuriform; [asp] pigmentation: hyaline, colourless; [asp] perispore, epispore: not apparent. Primary photobiont: present, chlorophytaceous – trentepohliaceous, trentepohlioid.. Secondary photobionts (eg in cephalodia): absent.