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Montana Field Guide

Montana Field Guides

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
MNPS Threat Rank:

External Links

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

On rock in low elevation boulderbeds.

Reproductive Characteristics
Asexual reproduction by soredia/isidia.

Threats or Limiting Factors
None identified.

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Citation for data on this website:
Pea-green Shield Lichen — Parmelia fraudans.  Montana Field Guide.  .  Retrieved on , from