Global occurrence: Eurasia – Europe | Americas – South and Central America | Arctic. Substrate: bryophytes – mosses, liverworts | rock, stones, pebbles – unspecified. Life habit: lichenized (mutualistic with algal photobionts). Thallus: squamulose (squamulous); [th] upper surface: grey(ish) green; [th marginal and upper surface] specific structures: absent; [th] lower surface: white(ish); [th lower surface] specific structures: present; [th lower surface] rhizines, rhizoid structures: absent. Ascomata: absent | present; ascoma: apothecial, apothecioid – hymenial; ascoma: pedicellate, stipitate, pedunculate, stalked; [ascm, if apoth] disc, mazaedium: brown(ish) (if pale: fawn, tan; if mid: cinnamon); [ascm] paraphyses/-oids: present. 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] septa: absent – spore lumen unilocular, monolocular; [asp] pigmentation: hyaline, colourless; [asp] perispore, epispore: not apparent. Conidiomata: absent | present; [co] length [µm]: (low) 5.0 (high) 14.0. Secondary metabolites: present, fumarprotocetraric acid | unknown/unidentified compound(s). Primary photobiont: present, chlorophytaceous – trebouxiaceous, chlorococcoid. Secondary photobionts (eg in cephalodia): absent.