Athyrium filix-femina var. angustum

(Willdenow) G. Lawson

Edinburgh New Philos. J. n.s. 19: 115. 1864

Common names: Northern lady fern
Basionyms: Aspidium angustum (Willdenow) C. Presl Sp. Pl. 5(1): 277. 1810
Synonyms: Athyrium angustum unknown Athyrium filix-femina subsp. angustum (Willdenow) Clausen Athyrium filix-femina var. michauxii (Sprengel) Farwell
Treatment appears in FNA Volume 2.
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Illustrator: John Myers
Petiole (7–)15–55 cm; scales brown to dark brown, linear-lanceolate, 8(–10) × 2 mm. Blade elliptic, 2-pinnatifid to 2-pinnate, (20–)30–75 × (5–)10–35 cm, moderately narrowed proximally, broadest near or just below middle, apex acuminate. Pinnae short-stalked or sessile, oblong-lanceolate. Pinnules decurrent onto costal wing or sessile, linear to oblong, base unequally cuneate, apex obtuse to acute or in larger leaves acuminate, lobed halfway or more to costules. Rachis, costae, and costules glabrous or with pale glands. Sori straight, less frequently hooked at distal end or horseshoe-shaped; sporangial stalks bearing glandular hairs; indusia irregularly dentate, ± ciliate. Spores yellow or brown. 2n = 80.

Habitat: Moist woods, swamps, thickets
Elevation: 0–1100 m


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Greenland, Man., N.B., Nfld., N.S., Ont., P.E.I., Que., Sask., Conn., Del., Ill., Ind., Iowa, Maine, Md., Mass., Mich., Minn., Mo., Nebr., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Pa., R.I., S.Dak., Vt., Va., W.Va., Wis.




Lower Taxa

No lower taxa listed.