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Montana Field Guide

Montana Field Guides

Least Shadow Lichen - Phaeophyscia kairamoi

Species of Concern
Native Species

Global Rank: G4G5
State Rank: S2
* (see State Rank Reason below)

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
This species occurs sporadically in the northern United States and southern Canada and is known from a few locations in western Montana.
  • Details on Status Ranking and Review
    Least Shadow Lichen (Phaeophyscia kairamoi) Conservation Status Review
    Review Date =
General Description
Thallus foliose, small, mostly 1-3 cm in diameter; apothecia often lacking; soredia marginal with granular isidioid soredia or isidia present; thallus bearing sparse pale or darkening cortical hairs, especially on young lobe tips, on apothecial margins, or on isidia/soredia McCune and Geiser 2009.

Diagnostic Characteristics
Similar to P. hirsuta, but with differing habitats. P. hirsuta is found on bark while P. kairamoi is found on rock McCune and Geiser 2009.

Range Comments
Boreal North America south to Arizona (McCune and Geiser 1997). Just found in California (Riefner 1995). Ontario.

Observations in Montana Natural Heritage Program Database
Number of Observations: 2

(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)

On rock, soil, or mosses over rock.

Reproductive Characteristics
Reproduces asexually from soredia and/or isidia and rarely sexually by spores from the apothecium.

Threats or Limiting Factors
None identified.

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Citation for data on this website:
Least Shadow Lichen — Phaeophyscia kairamoi.  Montana Field Guide.  .  Retrieved on , from