life habit: lichenized (mutualistic with algal photobionts) thallus: crustose (crustaceous) – episubstratal – unspecified thallus: cracked, fissured, fractured, rimose | compartimentized – areolate, squamulate [th] upper surface: white(ish) | blue(ish) white [th marginal and upper surface] specific structures: absent ascomata: absent | present ascoma: apothecial, apothecioid – hymenial ascoma [mm]: (median) 1.0 ascoma: immersed, innate | subsessile, subimmersed, adnate, semi-immersed, emergent | sessile, superficial [ascm, if apoth] disc, mazaedium: plane, flat, flattened, expanded [ascm, if apoth] disc, mazaedium: black(ish) | grey(ish) [ascm, if apoth] disc, mazaedium: pruinose [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: white(ish) | blue(ish) white [ascm, if apoth] margin excipular photobionts: present [ascm, if apoth] subhymenial layers, hypothecium; [if perith] basal excipulum: hyaline, colourless [ascm] paraphyses/-oids: present [ascm] epihymenium, epithecium: green(ish) | green(ish) brown (olive brown) asci: lecanoralean [asc] tholus: thickened [asc] tholus amyloidity (iodine reaction): absent ascospores: (low) 4.0 (high) 8.0 [asp] shape: subglobose, subspherical | ellipsoidal [asp] length [µm]: (low) 14.0 (high) 24.0 [asp] width [µm]: (low) 10.0 (high) 16.0 [asp] septa: absent – spore lumen unilocular, monolocular [asp] pigmentation: hyaline, colourless [asp] perispore, epispore: not apparent conidiomata: absent | present conidia: filiform, vermiform secondary metabolites: absent primary photobiont: present secondary photobionts (eg in cephalodia): absent primary photobiont: chlorophytaceous – trebouxiaceous, chlorococcoid. substrate: rock – calcareous, calciferous, basic | rock, stones, pebbles – unspecified.