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Montana Field Guide

Montana Field Guides

Roger's Vagabond Lichen - Circinaria rogeri
Other Names:  Aspicilia fruticulosa, Aspicilia rogeri

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Species of Concern
Native Species

Global Rank: G2G3
State Rank: S1
(see State Rank Reason below)

Agency Status


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State Rank Reason (see State Rank above)
In Montana known from one location in south-central region of the state.
General Description
Thallus fruticose. Thallus of erect hemispherical to spherical cushions of knobby balls. Branches terete (or nearly so), short, thick, blunt, and tipped with conspicuous pseudocyphellae. Branching is dichotomous and very compact McCune and Geiser 2009. Chemistry: Medulla K- or K+ red (developing slowly) McCune and Geiser 2009.

Range Comments
Eastern Montana, southern Idaho, and eastern Oregon (McCune and Geiser 1997). Also occurs in Nevada (data from Nevada Natural Heritage Program, May 2001).

Observations in Montana Natural Heritage Program Database
Number of Observations: 1

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Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Calcareous soil in dry areas. Occasionally found with A. hispida McCune and Geiser 2009.

Reproductive Characteristics
Reproduces by spores from apothecia, which are rarely produced.

Threats or Limiting Factors
None identified.

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Citation for data on this website:
Roger's Vagabond Lichen — Circinaria rogeri.  Montana Field Guide.  .  Retrieved on , from