Selaginella wallacei
Wallace's spike-moss

Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, Idaho, and Montana.

Habitat: Open rocky habitats from the lowlands to the midmontane.

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Mat-forming perennials, lithophytes or terrestrial; stems radially symmetric, creeping or decumbent, not easily fragmenting, forked irregularly, tips straight; main stem long and indeterminate with determinate lateral branches, ascending, 1-2-forked; rhizophores emerging from underside of stems, throughout the length of the stem, 0.2-0.4 mm in diameter.


Leaves monomorphic, arranged in somewhat alternating pseudowhorls of 4, appressed tightly or loosely, ascending, green, linear-lanceolate, generally 1.8-3.5 mm long and 0.4-0.7 mm broad, ridges on underside of leaves well defined, base rounded and adnate or cuneate and somewhat decurrent on loosely appressed stem leaves, pubescent or rarely glabrous; margins short-ciliate to finely toothed, cilia transparent, ascending toward apex; apex keeled and obtuse, occasionally attenuate or plane and attenuate, abruptly ending with short or long bristle; bristle transparent to slightly white, puberulent, sometimes breaking off, usually 0.2-0.5 mm; sporophylls usually deltate-ovate on exposed, compact mats, lanceolate-ovate on loose mats in wet habitats, ridges beneath well defined, base glabrous, margins short-ciliate to finely toothed, apex keeled, abruptly ending with short bristle, rarely tapering to bristle.


Strobili commonly paired, typically 1-4.5 cm, quadrangular; sporangia on short stalks, solitary in axil of sporophylls, opening by distal slits; spores of 2 kinds, megaspores to 4, microspores numerous.

Accepted Name:
Selaginella wallacei Hieron.
Publication: Hedwigia. 39: 297. 1900.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Selaginella wallacei in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Selaginella wallacei checklist entry.

E-Flora BC: Selaginella wallacei atlas page.

CalPhotos: Selaginella wallacei photos.

USDA Plants: Selaginella wallacei information.

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