Nephroma arcticum (L.) Torss.  
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Family: Nephromataceae
[Lichen arcticus L., moreNephromium arcticum (L.) Hav., Opisteria antarctica (Wulfen) Vain., Opisteria antarctica var. antarctica (Wulfen) Vain., Opisteria antarctica var. lobuligera (Müll. Arg.) Räsänen, Opisteria antarctica var. normalis (Vain.) Räsänen, Opisteria arctica (L.) Vain., Parmelia arctica (L.) Linds., Peltidea arctica (L.) Wahlenb., Peltigera arctica (L.) Räuschel]
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Stephen Sharnoff  
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Life habit: lichenized (mutualistic with algal photobionts) thallus: foliose (foliaceous), leaf-like thallus: continuous, diffuse, effuse [th] upper surface: yellow(ish) grey | yellow(ish) green [th upper surface]: epruinose [th marginal and upper surface] specific structures: present [th margin] cilia, cilioid structures: absent [th upper surface] isidia, isidioid structures: absent [th upper surface] soredia, soralia, soralioid structures: absent [th] morphol substructures (eg areoles, lobes, branches) width [mm]: (min) 30.0 [th] morphol substructures (eg areoles, squamules): contiguous, coherent (throughout the thallus) | distantly discontiguous [th] morphol substructures (eg areoles, lobes, branches) upper surface: smooth, plane | rugose, plicate, folded, pustulate, faveolate, wrinkled | uneven, undulate [th] lower surface: brown(ish) (if pale: fawn, tan; if mid: cinnamon) | brown(ish) black | brown(ish) white ascomata: absent | present ascoma: apothecial, apothecioid – hymenial ascoma [mm]: (median) 20.0 (max) 30.0 ascoma: sessile, superficial [ascm, if apoth] disc, mazaedium: brown(ish) (if pale: fawn, tan; if mid: cinnamon) | brown(ish) black | red(dish) brown (if pale: orange brown) [ascm, if apoth] disc, mazaedium: epruinose [ascm] paraphyses/-oids: present asci: lecanoralean [asc] tholus: thickened [asc] tholus amyloidity (iodine reaction): absent ascospores: (median) 8.0 [asp] shape: elongate-fusiform, ellipsoidal-fusiform [asp] length [µm]: (low) 23.0 (high) 27.0 [asp] width [µm]: (low) 4.0 (high) 5.0 (max) 6.0 [asp] septa: present [asp] septa: transversely septate [asp] transversal septa: (median) 3.0 [asp] pigmentation: pale brown [asp] perispore, epispore: not apparent conidiomata: absent | present conidia: bacilliform, bacillar [co] length [µm]: (low) 3.0 (high) 4.0 secondary metabolites: present secondary metabolites: methyl gyrophorate | nephroarctin | phenarctin | usnic acid | zeorin (hopane-6α,22-diol) primary photobiont: present secondary photobionts (eg in cephalodia): absent | present primary photobiont: chlorophytaceous – trebouxiaceous, chlorococcoid.

substrate: soil, clay, humus, turf, detritus, dead leaves | bryophytes – mosses, liverworts | bark, cork, plant surface – trunks, branches, twigs | rock, stones, pebbles – unspecified.
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Stephen Sharnoff  
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Stephen Sharnoff  
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