Global occurrence: Eurasia – Europe. Substrate: wood – dead, living | bark, cork, plant surface – trunks, branches, twigs. Life habit: lichenized (mutualistic with algal photobionts). Thallus: crustose (crustaceous) – episubstratal – unspecified; thallus: compartimentized – areolate, squamulate; [th] upper surface: grey(ish) | brown(ish) grey | grey(ish) brown; [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. Ascomata: absent | present; ascoma: apothecial, apothecioid – hymenial; ascoma [mm]: (median) 1.0 (max) 1.2; ascoma: sessile, superficial; [ascm, if apoth] disc, mazaedium: subconvex, slightly convex | convex | distinctly convex | strongly convex, hemispherical, (sub-)globose; [ascm, if apoth] disc, mazaedium: grey(ish) | grey(ish) black | black(ish) grey | blue(ish) grey | grey(ish) blue; [ascm, if apoth] subhymenial layers, hypothecium; [if perith] basal excipulum: green(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon); [ascm] paraphyses/-oids: present; [ascm] epihymenium, epithecium: green(ish) | brown(ish) (if pale: fawn, tan; if mid: cinnamon) | green(ish) blue | blue(ish) green (turquoise). Asci: lecanoralean; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): present. Ascospores: (median) 8.0; [asp] shape: ellipsoidal; [asp] length [µm]: (low) 9.0 (high) 15.0; [asp] width [µm]: (low) 4.0 (high) 7.0; [asp] septa: absent – spore lumen unilocular, monolocular; [asp] pigmentation: hyaline, colourless; [asp] perispore, epispore: not apparent. Secondary metabolites: present, isosphaeric acid | sphaerophorin. Primary photobiont: present, chlorophytaceous – trebouxiaceous, chlorococcoid. Secondary photobionts (eg in cephalodia): absent.