Global occurrence: Eurasia – Asia Extratropical | Eurasia – Europe | Americas – North America (incl Mexico) | Arctic.  Substrate: soil, clay, humus, turf, detritus, dead leaves | bryophytes – mosses, liverworts.  Life habit: lichenized (mutualistic with algal photobionts).  Thallus: squamulose (squamulous) | foliose (foliaceous), leaf-like; [th] upper surface: brown(ish) (if pale: fawn, tan; if mid: cinnamon) | blue(ish) grey; [th upper surface]: epruinose; [th marginal and upper surface] specific structures: absent; [th] morphol substructures (eg areoles, lobes, branches) width [mm]: (min) 0.1 (low) 0.2 (high) 0.5 (max) 1.0; [th] morphol substructures (eg areoles, squamules): distantly discontiguous; [th] morphol substructures (eg areoles, lobes, branches) upper surface: smooth, plane; [th] morphol substructures (eg lobes, branches): irregular; [th] lower surface: blue(ish) grey; [th lower surface] specific structures: present; [th lower surface] rhizines, rhizoid structures: absent.  Ascomata: absent | present; ascoma: apothecial, apothecioid – hymenial; ascoma [mm]: (low) 0.3 (high) 1.0; ascoma: sessile, superficial; [ascm, if apoth] disc, mazaedium: concave; [ascm, if apoth] disc, mazaedium: brown(ish) (if pale: fawn, tan; if mid: cinnamon); [ascm, if apoth] disc, mazaedium: epruinose; [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: brown(ish) (if pale: fawn, tan; if mid: cinnamon) | blue(ish) grey; [ascm, if apoth] margin excipular photobionts: present | abundant; [ascm, if apoth] subhymenial layers, hypothecium; [if perith] basal excipulum: yellow(ish) (if dull: buff) | hyaline, colourless; [ascm] paraphyses/-oids: present; [ascm] paraphyses/-oid cells width [µm]: (low) 1.0 (high) 2.0; [ascm] epihymenium, epithecium: brown(ish) (if pale: fawn, tan; if mid: cinnamon).  Asci: lecanoralean; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): present; [asc] tholus amyloidity pattern: with amyloid tube, ring (= Collema-, Micarea-, Porpidia-, Psora-types etc).  Ascospores: (median) 8.0; [asp] shape: ellipsoidal; [asp] length [µm]: (low) 20.0 (high) 35.0; [asp] width [µm]: (low) 7.0 (high) 15.0; [asp] septa: present; muriformly septate – muriform, submuriform; [asp] pigmentation: hyaline, colourless; [asp] perispore, epispore: not apparent. Secondary metabolites: absent.  Primary photobiont: present, cyanobacterial.  Secondary photobionts (eg in cephalodia): absent.