Global occurrence: Eurasia – Europe | Arctic.  Substrate: bark, cork, plant surface – trunks, branches, twigs.  Life habit: lichenized (mutualistic with algal photobionts).  Thallus: crustose (crustaceous) – endosubstratal, inconspicuous, immersed | crustose (crustaceous) – episubstratal – unspecified; thallus: compartimentized – areolate, squamulate; [th] upper surface: green(ish) grey; [th marginal and upper surface] specific structures: present; [th margin] cilia, cilioid structures: absent; [th upper surface] isidia, isidioid structures: absent; [th upper surface] soredia, soralia, soralioid structures: present; [th] morphol substructures (eg areoles, lobes, branches) width [mm]: (low) 0.1 (high) 0.1; [th] morphol substructures (eg areoles, lobes, branches) upper surface: verrucose, warted.  Ascomata: absent | present; ascoma: apothecial, apothecioid – hymenial; ascoma [mm]: (low) 0.15 (high) 0.25 (max) 0.45; ascoma: sessile, superficial; [ascm, if apoth] disc, mazaedium: subconvex, slightly convex; [ascm, if apoth] disc, mazaedium: brown(ish) yellow (ochraceous, ochre) | white(ish) brown (beige); [ascm, if apoth] disc, mazaedium: epruinose; [ascm, if apoth] subhymenial layers, hypothecium; [if perith] basal excipulum: hyaline, colourless; [ascm] paraphyses/-oids: present; [ascm] epihymenium, epithecium: yellow(ish) brown.  Asci: lecanoralean; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): present; [asc] tholus amyloidity pattern: amyloid with acuate axial body towards the apex (= Bacidia-, Buellia-, Ramalina-types etc).  Ascospores: (median) 8.0; [asp] shape: narrowly ellipsoidal; [asp] length [µm]: (min) 7.5 (low) 9.9 (high) 10.5 (max) 14.0; [asp] width [µm]: (min) 2.5 (low) 2.8 (high) 3.3 (max) 4.0; [asp] septa: absent – spore lumen unilocular, monolocular | present; [asp] septa: transversely septate; [asp] transversal septa: (median) 0.0 (max) 0.0; [asp] pigmentation: hyaline, colourless; [asp] perispore, epispore: not apparent.  Secondary metabolites: present, gyrophoric acid.  Primary photobiont: present, chlorophytaceous – trebouxiaceous, chlorococcoid.  Secondary photobionts (eg in cephalodia): absent.