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Athyrium filix-femina  
Family: Athyriaceae
[Polypodium incisum Sw., morePolypodium laetum Raddi]
Athyrium filix-femina image
  • FNA
  • Gleason & Cronquist
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Masahiro Kato in Flora of North America (vol. 2)
Stems short-creeping or ascending. Petiole straw-colored distally, 7--60 cm, base dark red-brown or black, swollen, with 2 rows of teeth; scales light to dark brown, linear- to ovate-lanceolate, 7--20 × 1--5 mm. Blade elliptic, lanceolate to oblanceolate, 2-pinnate to 2-pinnate-pinnatifid, 18--30 × 5--50 cm, herbaceous but with cartilaginous margin, narrowed to base, apex acuminate. Pinnae sessile to short-stalked, linear-oblong to lanceolate, apex acuminate. Pinnules pinnatifid, segments oblong-linear to narrowly deltate, margins serrate. Rachis , costae, and costules glabrous or with glands or hairs. Veins pinnate. Sori straight, hooked at distal end, or horseshoe-shaped; indusia dentate or ciliate. Athyrium filix-femina is circumboreal, and this or closely related species extend into Mexico, Central America, and South America. The delimitation and infraspecific classification of A . filix-femina need detailed study.

Vascular plants of NE US and adjacent Canada
Rhizome short-creeping to suberect, the lvs clustered near its tip, 4-10 dm; blade 10-35 cm wide, acuminate, slightly reduced below, sparsely scaly, otherwise glabrous or minutely glandular, mostly bipinnate or bipinnate-pinnatifid; pinnae 20-30 pairs below the pinnatifid tip, lance-linear, subsessile, attenuate-acuminate, the pinnules mostly serrate to deeply parted, obtuse to acuminate; veins forking, directed into the teeth; indusia dark brown, thin, ciliate (at least when young) mostly short and ±curved or hooked, commonly crossing the veins; 2n=80. Moist woods, meadows, and streambanks; cosmopolitan and highly variable, two vars. in our area:

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
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The PCC, and this data portal, were made possible by funding from the National Science Foundation’s Advancing Digitization of Biological Collections (ADBC) program, grant numbers 1802504, 1802352, 1802134, 1802033, 1802270, 1802255, 1802239, 1802446, 1802305.
The pteridoportal taxonomic thesaurus is based on the Checklist of Ferns and Lycophytes of the World, generously provided by Michael Hassler.