Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

Pea-green Scale Lichen - Psora rubiformis

Potential Species of Concern
Native Species

Global Rank: G3G5
State Rank: S1S2
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
In Montana widely scattered populations have been found in northwest, southwest, and southeast.
General Description
Thallus squamulose, pale yellowish green to pale brownish green; squamules ascending, more or less imbricate, and 1-3(4) mm in diameter (McCune and Goward 1995).

Diagnostic Characteristics
Historically this name was widely mis-applied. Specimens should be verified by a lichenologist.

Observations in Montana Natural Heritage Program Database
Number of Observations: 5

(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)

On soil and in fissures of rock in alpine sites.

Reproductive Characteristics
Reproduction is by spores from apothecia.

Threats or Limiting Factors
Climate change.

Login Logout
Citation for data on this website:
Pea-green Scale Lichen — Psora rubiformis.  Montana Field Guide.  .  Retrieved on , from