Montana Field Guide

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- Kingdom - - Fungi
  - Division - Sac Fungi - Ascomycota
    - Class - (Lecanoromycetes) - Lecanoromycetes
      - Order - Lecanorales - Lecanorales
        
        Family - Parmeliaceae - Parmeliaceae
        
        Species - Pea-green Shield Lichen - Parmelia fraudans

Pea-green Shield Lichen - Parmelia fraudans

Potential Species of Concern
Native Species

Global Rank: G5
State Rank: S1
(see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:

State Rank Reason (see State Rank above)

Rare in the Pacific Northwest (McCune and Goward 2009); Infrequently collected in Montana and adjacent states.

General Description

Thallus foliose and somewhat appressed to substrate; upper surface gray, pale blue gray, white, or brownish when exposed to sun; lower surface black and abundantly rhizinate; soredia coarsely granular to isidiate, mostly marginal, and soredia yellowish; and rhizines simple or dichotomous McCune and Geiser 2009. Chemistry: Medulla K+ yellow to red McCune and Geiser 2009.

Range Comments

Widespread.

Observations in Montana Natural Heritage Program Database

Number of Observations: 4

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

Relative Density

Recency

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

Habitat

On rock in low elevation boulder beds.

Reproductive Characteristics

Asexual reproduction by soredia/isidia.

Stewardship Responsibility

Threats or Limiting Factors

None identified.

References

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Citation for data on this website:
Pea-green Shield Lichen — Parmelia fraudans. Montana Field Guide. Montana Natural Heritage Program. Retrieved on April 7, 2026, from https://FieldGuide.mt.gov/speciesDetail.aspx?elcode=NLT0020550