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Montana Field Guide

Montana Field Guides

Easter Foam Lichen - Stereocaulon paschale

Species of Concern
Native Species

Global Rank: G5
State Rank: S1S2
(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 northwest and south-central Montana.
General Description
Thallus fruticose with erect stalks (pseudopodetia); cephalodia abundant, blue-greenish to dark brownish, scabrid, usually forming blackish, spiky clusters, containing Stigonema. Stalks to 6 cm tall, naked below with white to rosy tomentum above; phyllocladia white or gray white, occasionally rose-tinged, warty, coralloid, or rarely somewhat squamulose; and apothecia uncommon, to 3 mm diameter (McCune and Geiser 2009). Chemistry: Medulla K-, P-, KC+ violet or orange (McCune and Geiser 2009).

Diagnostic Characteristics
Fruticose form that grows on soil, humus or soil over rock; abundant cephalodia.

Range Comments
Arctic to Washington and Montana (McCune and Goward 2009).

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

(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)

Loosely attached and growing on soil, humus, or among mosses.

Photobionts: green algae and cyanobacteria.

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:
Easter Foam Lichen — Stereocaulon paschale.  Montana Field Guide.  .  Retrieved on , from