Athyrium filix-femina var. angustum

(Willdenow) G. Lawson

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

Common names: Northern lady fern
IllustratedEndemic
Basionym: Aspidium angustum (Willdenow) C. Presl Sp. Pl. 5(1): 277. 1810
Synonyms: Athyrium angustum Athyrium filix-femina subsp. angustum (Willdenow) Clausen Athyrium filix-femina var. michauxii (Sprengel) Farwell
Treatment appears in FNA Volume 2.

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

Distribution

V2 352-distribution-map.gif

Greenland, Man., N.B., Nfld. and Labr. (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.

Discussion

Selected References

None.

Lower Taxa

None.
Lobed (?) +, In larger leaves (?) +, Obtuse (?) +  and Acute (?) +
Masahiro Kato +
(Willdenow) G. Lawson +
black;dark redbrown +
persisting +
cuneate +, linear +  and oblong +
Aspidium angustum +
simple to commonly +
20 cm200 mm <br />0.2 m <br /> (30 cm300 mm <br />0.3 m <br />) +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
30 cm300 mm <br />0.3 m <br /> (?) +  and 75 cm750 mm <br />0.75 m <br /> (?) +
narrowed;2-pinnatifid;2-pinnate +
reduced +
just below middle middle;broadest;10cm;35cm +
roundish +
Northern lady fern +
with pale glands +  and glabrous +
Greenland +, Man. +, N.B. +, Nfld. and Labr. (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. +  and Wis. +
0–1100 m +
often +  and glabrous +
Moist woods, swamps, thickets +
ciliate +  and dentate +
monomorphic +
7 cm70 mm <br />0.07 m <br /> (15 cm150 mm <br />0.15 m <br />) +
straw-colored +
0.5 times length of blade;0.5 times length of blade +
15 cm150 mm <br />0.15 m <br /> (55 cm550 mm <br />0.55 m <br />) +
sessile +  and short-stalked +
decurrent +
sessile +  and short-petiolulate +
Edinburgh New Philos. J. +
with glands or hairs +  and glabrous +
round +, cuplike +, hoodlike +, reniform +, falcate +  and linear +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
brown;dark-brown +
persistent +
8 cm80 mm <br />0.08 m <br /> (?) +
linear-lanceolate +
crenate +  and serrulate +
straight +
persistent +
with narrow sinus +  and attached +
discrete +
horseshoe--shaped +  and hooked +
Illustrated +  and Endemic +
brown +  and yellow +
reniform +  and oblong +
dictyostelic +, unbranched +  and branched +
ascending +  and short-creeping +
Athyrium angustum +, Athyrium filix-femina subsp. angustum +  and Athyrium filix-femina var. michauxii +
Athyrium filix-femina var. angustum +
Athyrium filix-femina +
variety +
epiphytic +  and hemiepiphytic +