Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

Subcentric Ring Lichen - Arctoparmelia subcentrifuga

Species of Concern
Native Species

Global Rank: G4G5
State Rank: S1
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
In Montana known from a few sites in the western and central regions of the state.
General Description
Thallus foliose, yellowish green. Soredia present on the upper surface McCune and Geiser 2009.

Diagnostic Characteristics
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.

Range Comments
Occurs in the arctic south to Colorado; also in the Great Lakes region.

Observations in Montana Natural Heritage Program Database
Number of Observations: 1

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Siliceous rock in montane to subalpine sites.

Reproductive Characteristics
Reproduces asexually by soredia.

Threats or Limiting Factors
None identified.

Login Logout
Citation for data on this website:
Subcentric Ring Lichen — Arctoparmelia subcentrifuga.  Montana Field Guide.  .  Retrieved on , from