E-Flora BC: Electronic Atlas of the Flora of British Columbia

Arctoparmelia centrifuga (L.) Hale
Rippled ring
N.A.

Introduction to the Lichens

© Curtis Bjork  Email the photographer   (Photo ID #19052)

E-Flora BC Static Map
Distribution of Arctoparmelia centrifuga
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Consortium of North American Lichen Herbaria map

Species Information

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Illustration By: Trevor Goward

General:
Medium to large stratified foliose lichens, corticate above and below, sorediate or not, lobes closely appressed, elongate, averaging to 0.3–0.5 mm wide, thin. Upper surface pale yellowish green, dull. Lower surface pale to black, apparently white-pruinose, bearing scattered, short, simple rhizines. Medulla white. Photobiont green. Apothecia located over upper surface, disc brown; spores simple, ellipsoid, colourless, 8 per ascus. Over acid rock in arctic-alpine to boreal localities.

Notes: Arctoparmelia consists of four species worldwide, all of which occur in B.C. For points of distinction with similar species in other genera, see the descriptions under Xanthoparmelia.
Species description:
Thallus lacking soredia AND Upper cortex firm, never eroding; lobe tips only rarely downturned AND Lower surface whitish or tan throughout; widespread
Reactions:
Cortex K+ pale yellow, KC+ yellow; medulla C+ slowly yellow, KC+ reddish.
Contents:
Alectoronic acid, atranorin and usnic acid.

Source: Lichens of British Columbia

Habitat / Range

Habitat: Frequent over acid or somewhat base-rich rock in open inland sites, especially in boulderbeds
World Distribution: circumpolar, S to OR.

Source: Lichens of British Columbia

Synonyms and Alternate Names

Arctoparmelia aleuritica (Nyl.) Hale
Parmelia aleuritica Nyl.
Parmelia centrifuga
Xanthoparmelia centrifuga (L.) Hale

Taxonomic and Nomenclatural Links

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