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Montana Field Guide

Montana Field Guides

Tattered Rag Lichen - Platismatia herrei

Potential Species of Concern

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

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:

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State Rank Reason (see State Rank above)
Known from a few locations in northwestern Montana.
 
General Description
Thallus foliose, suberect to drooping off the substrate, to 10(15) cm long; lobes mostly 1-3(5) mm broad (occasionally broader in 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 present mainly on the lobe margins; and apothecia rare McCune and Geiser 2009. Chemistry: Cortex K+ yellow; Medulla K-, C-, KC-, and P- McCune and Geiser 2009.

Diagnostic Characteristics
Large individuals are easily identified by the elongate, narrow lobes with marginal isidia. Some specimens can be similar to those forms of P. glauca that have narrow lobes; one must separate them by the type of asexual reproduction. P. glauca has either soredia or a combination of soredia and isidia while P. herrei has only true isidia (covered with a cortex and therefore shiny) McCune and Geiser 2009.

Range Comments
This lichen occurs from Alaska to California, is common in the West Cascade Mountains, but is disjunct to northern Idaho and northwest Montana.

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

Reproductive Characteristics
Reproduces asexually by isidia.

Threats or Limiting Factors
None identified.

References
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Citation for data on this website:
Tattered Rag Lichen — Platismatia herrei.  Montana Field Guide.  .  Retrieved on , from