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Montana Field Guide

Montana Field Guides

A Lichen - Platismatia stenophylla
Other Names:  Cetraria stenophylla

Potential Species of Concern

Global Rank: G4?
State Rank: S1
* (see State Rank Reason below)

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
Known from a few locations in western Montana.
General Description
Thallus foliose, bushy erect, to 10(15) cm broad; lobes mostly 1-2(3)mm broad (occasionally broader in the basal parts); upper surface whitish, grayish, pale greenish gray, or browned in exposed sites; lower surface black, brown, white, or with patches of these colors; rhizines few; isidia and soredia lacking; pycnidia dark, marginal; and apothecia common McCune and Geiser 2009. Chemistry: cortex K+ yellow, medulla K-, C-, KC-, and P- McCune and Geiser 2009.

Diagnostic Characteristics
The elongate, narrow, erect lobes lacking soredia and isidia are diagnostic. P. herrei can be similar, but bears isidia McCune and Geiser 2009.

Species Range

Range Comments
This lichen occurs from southern British Columbia to California, and is common in the West Cascade Mountains of Oregon to Washington, with rare inland disjuncts to western Montana.

Summary of Observations Submitted for Montana
Number of Observations: 3

(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)

Generally on conifer bark and wood in low elevation, mesic forests.

Reproductive Characteristics
Reproduces sexually by spores from the apothecium.

Threats or Limiting Factors
None identified.

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Citation for data on this website:
A Lichen — Platismatia stenophylla.  Montana Field Guide.  .  Retrieved on , from