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Verrucaria degelii R. Sant.
Family: Verrucariaceae
Verrucaria degelii image

Global occurrence: Eurasia – Europe | Americas – North America (incl Mexico) | Arctic.  Substrate: rock, stones, pebbles – unspecified.  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) | black(ish) green; [th marginal and upper surface] specific structures: absent.  Ascomata: absent | present; ascoma: perithecial, perithecioid – hymenial; ascoma [mm]: (median) 1.0; ascoma: immersed, innate; [ascm, if apoth] margin excipular photobionts: absent; [ascm] paraphyses/-oids: absent.  Asci: fissitunicate – verrucarialean; [asc] tholus: thickened; [asc] tholus amyloidity (iodine reaction): absent.  Ascospores: (median) 8.0; [asp] shape: ellipsoidal; [asp] length [µm]: (low) 7.0 (high) 10.0; [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: absent.  Primary photobiont: present, chlorophytaceous – trebouxiaceous, chlorococcoid.  Secondary photobionts (eg in cephalodia): absent.