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Umbilicaria arctica (Ach.) Nyl.
Family: Umbilicariaceae
[Gyrophora arctica Ach.,  more]
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Lucy Taylor  
Life habit: lichenized (mutualistic with algal photobionts) thallus: peltate, umbilicate thallus: continuous, diffuse, effuse [th] morphol substructures (eg areoles, squamules): distantly discontiguous ascomata: absent | present ascoma: apothecial, apothecioid – hymenial ascoma [mm]: (low) 1.0 (high) 2.5 ascoma: sessile, superficial [ascm, if apoth] disc, mazaedium: subconvex, slightly convex | convex [ascm, if apoth] disc, mazaedium: black(ish) [ascm, if apoth] disc, mazaedium: epruinose [ascm, if apoth] margin surface; [if perith] periostiolar area, ostiole, involucrellum: black(ish) [ascm, if apoth] margin excipular photobionts: absent [ascm, if apoth] subhymenial layers, hypothecium; [if perith] basal excipulum: black(ish) [ascm] paraphyses/-oids: present [ascm] paraphyses/-oid cells width [µm]: (median) 1.7 [ascm] epihymenium, epithecium: black(ish) asci: lecanoralean [asc] tholus: thickened [asc] tholus amyloidity (iodine reaction): present [asc] tholus amyloidity pattern: entirely amyloid (= Catillaria-, Teloschistes-types etc) ascospores: (median) 8.0 [asp] shape: ellipsoidal [asp] length [µm]: (low) 8.5 (high) 15.0 [asp] width [µm]: (low) 4.0 (high) 8.5 [asp] septa: absent – spore lumen unilocular, monolocular [asp] pigmentation: hyaline, colourless [asp] perispore, epispore: not apparent conidiomata: absent | present conidia: cylindrical [co] length [µm]: (low) 4.8 (high) 5.2 secondary metabolites: present secondary metabolites: gyrophoric acid | norstictic acid primary photobiont: present secondary photobionts (eg in cephalodia): absent primary photobiont: chlorophytaceous – trebouxiaceous, chlorococcoid.

substrate: rock – siliceous, siliciferous, acidic.
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Troy McMullin  
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Troy McMullin  
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