Subcentric Ring Lichen - Arctoparmelia subcentrifuga
State Rank Reason (see State Rank above)
In Montana known from a few sites in the western and central regions of the state.
Thallus foliose, yellowish green. Soredia present on the upper surface McCune and Geiser 2009
Superficially similar to Xanthoparmelia. Arctoparmelia differs in chemistry; has a lower surface that is often velvety, ivory white to gray, black, or purplish; often has narrower lobes; and geographically restricted to boreal and arctic regions McCune and Geiser 2009
Occurs in the arctic south to Colorado; also in the Great Lakes region.
Observations in Montana Natural Heritage Program Database
Number of Observations:
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(Observations spanning multiple months or years are excluded from time charts)
Siliceous rock in montane to subalpine sites.
Reproduces asexually by soredia.
Threats or Limiting Factors