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Montana Field Guide

Montana Field Guides

A Lichen - Lobaria hallii

Species of Concern

Global Rank: G4?
State Rank: S2
* (see State Rank Reason below)

Agency Status
MNPS Threat Rank:

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State Rank Reason (see State Rank above)
Known from several locations in western Montana.
General Description
Thallus foliose, mostly 2-12(20) cm broad, single lobed or with several broadly rounded lobes; lobes to 5 cm broad; upper surface gray to brownish gray; lower surface pale brown or whitish, tomentose; upper cortex rough and scabrous, finely but usually sparsely tomentose, especially near lobe tips (use hand lens); photobiont blue-green; soredia occurs in roundish laminal and marginal soralia; apothecia are uncommon McCune and Geiser 2009 . Chemistry: Cortex K+Y and all other spot tests are negative McCune and Geiser 2009 .

Diagnostic Characteristics
When dry L. hallii has a steel grey color to its thallus while L. scrobiculata has a yellowish cast. When wet these species are difficult to separate. Look for the fine, but scattered hairs on the lobe tips of L. hallii and negative spot tests of the medulla McCune and Geiser 2009 . Because these species are rare, they should be collected very sparingly or not at all.

Species Range

Summary of Observations Submitted for Montana
Number of Observations: 22

(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)

Substrate: On bark and wood. Usually on Populus, though sometimes on other deciduous trees or shrubs.

Habitat: Moist lowland riparian areas.

This lichen is a nitrogen fixer.

Reproductive Characteristics
Reproduces primarily asexually from soredia; may reproduce sexually by spores from the apothecium.

Threats or Limiting Factors
None identified.

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