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

Arctoparmelia subcentrifuga (Oxner) Hale
abrading ring

Introduction to the Lichens

© Curtis Bjork  Email the photographer   (Photo ID #22883)

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

Species Information

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 sorediate or apparently sorediate AND Upper cortex soft and eroding; soredia more or less diffuse


Thallus lacking soredia AND
Upper cortex soft and eroding; lobe tips generally downturned
Medulla KC+ pinkish.
Alectoronic acid, alpha-collatolic acid, atranorin, (and unidentified purple pigment).

Source: Lichens of British Columbia

Habitat / Range

Habitat: Rare over acid and somewhat base-rich rock in rather sheltered intermontane sites
World Distribution: apparently western N Am – eastern N Am – eastern Eurasia, N to AK, S to southern BC.

Source: Lichens of British Columbia

Synonyms and Alternate Names

Parmelia subcentrifuga Oksner
Xanthoparmelia subcentrifuga (Oksner) Hale

Taxonomic and Nomenclatural Links

Additional Range and Status Information Links

Additional Photo Sources

General References