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; [th] upper surface: green(ish) white | yellow(ish) white (ivory, off-white, cream-coloured); [th marginal and upper surface] specific structures: absent; [th] morphol substructures (eg areoles, lobes, branches) upper surface: smooth, plane. Ascomata: absent | present; ascoma: perithecial, perithecioid – hymenial; ascoma [mm]: (low) 0.45 (high) 1.0; ascoma: immersed, innate | subsessile, subimmersed, adnate, semi-immersed, emergent | sessile, superficial; [ascm] paraphyses/-oids: present. Asci: fissitunicate – bitunicate; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): absent. Ascospores: (median) 8.0; [asp] shape: filiform, vermiform; [asp] length [µm]: (low) 80.0 (high) 110.0; [asp] width [µm]: (low) 1.5 (high) 2.5; [asp] septa: present, transversely septate; [asp] transversal septa: (median) 8.0; [asp] pigmentation: hyaline, colourless. Conidiomata: absent | present. Conidia: filiform, vermiform; [co] length [µm]: (low) 60.0 (high) 100.0. Secondary metabolites: absent. Primary photobiont: present, chlorophytaceous – trentepohliaceous, trentepohlioid. Secondary photobionts (eg in cephalodia): absent.