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Arctoparmelia centrifuga (L.) Hale
Family: Parmeliaceae
[Arctoparmelia aleuritica (Nyl.) Hale,  more]
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Stephen Sharnoff  
Thompson, J., 1984. American Arctic Lichens: The Macrolichens.
Thallus foliose, closely adnate to the substratum, commonly dying in the center and forming concentric rings, the lobes irregularly branching, the tips pointed, flat to slightly convex, 2 mm broad; upper side greenish yellow, partly whitish green, darkening toward the center; dull, sometimes chinky, lacking soredia or isidia; underside whitish or pale brownish with brown to blackish rhizines; medulla white. Apothecia adnate, to 5 mm broad, the margin entire to crenulate or inflexed, concolorous with the thallus; disk reddish or dark brown, dull; epithecium brownish; hypothecium and hymenium hyaline; spores ellipsoid, 8-14x4.5-6 μ.

Reactions: hymenium 1+ blue; cortex K+ yellow; medulla I— , K— , KC+ red, P— .

Contents: usnic acid, alectoronic acid, atranorin.

This species grows on rocks, preferably acid, usually in strong light but in more shady spots becoming softer in texture. It is circumpolar, arctic-alpine, ranging south in North America into the Appalachian Mountains and near the northern shores of the Great Lakes.

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Lucy Taylor  
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Troy McMullin  
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Troy McMullin  
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Troy McMullin  
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Jason Hollinger  
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Stephen Sharnoff  
Arctoparmelia centrifuga image
Stephen Sharnoff  
Arctoparmelia centrifuga image
Stephen Sharnoff  
Arctoparmelia centrifuga image
Stephen Sharnoff  
Arctoparmelia centrifuga image
Stephen Sharnoff  
Arctoparmelia centrifuga image
Stephen Sharnoff  
Arctoparmelia centrifuga image
Stephen Sharnoff  
Arctoparmelia centrifuga image
Stephen Sharnoff  
Arctoparmelia centrifuga image
Stephen Sharnoff  
Arctoparmelia centrifuga image
Stephen Sharnoff  
Arctoparmelia centrifuga image
Stephen Sharnoff  
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