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FNA | Family List | FNA Vol. 2 | Dryopteridaceae | Dryopteris

3. Dryopteris arguta (Kaulfuss) Maxon, Amer. Fern J. 11: 3. 1921.

Marginal wood fern, coastal wood fern

Aspidium argutum Kaulfuss, Enum. Filic., 242. 1824

Leaves monomorphic, green through winter, 25--90 × 8--30 cm. Petiole 1/4--1/3 length of leaf, scaly at least at base; scales scattered, light brown. Blade green to yellow-green, ovate-lanceolate, pinnate-pinnatifid to 2-pinnate at base, herbaceous, glandular. Pinnae ± in plane of blade, lance-oblong; basal pinnae deltate, not much reduced, basal pinnules ± same length as adjacent pinnules, basal basiscopic pinnule and basal acroscopic pinnule ± equal, pinnule margins serrate with spreading, spinelike teeth. Sori midway between midvein and margin of segments. Indusia lacking glands. 2 n = 82.

Shaded slopes and open woods; 0--2100 m; B.C.; Ariz., Calif., Oreg., Wash.; Mexico in Baja California.

Dryopteris arguta is somewhat variable. It has been suggested that more than one taxon is involved. No hybrids involving D . arguta are known.


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