Athyrium
lady-fern
short-creeping or ascending, stolons absent.
monomorphic, usually dying back in winter.
± 0.5 times length of blade or less, base swollen and dentate, persisting as trophopod over winter or not;
vascular bundles 2, lateral, lunate in cross section.
lanceolate to elliptic or oblanceolate, 1–3-pinnate-pinnatifid, gradually reduced distally to confluent, pinnatifid apex, herbaceous.
not articulate to rachis, segment margins serrulate or crenate;
proximal pinnae often reduced, sessile to short-petiolulate, ± equilateral;
costae adaxially grooved, grooves continuous from rachis to costae to costules;
indument absent or of linear to lanceolate scales or 1-celled glands abaxially.
free, simple or forked.
in 1 row between midrib and margin, round to elongate, straight or hooked at distal end, or horseshoe-shaped;
indusia shaped like sori, persistent, attached laterally or with narrow sinus, or indusia absent.
brownish, rugose.
= 40.
Athyrium
In species outside the flora stems are sometimes long-creeping to erect, with leaves radially or dorsiventrally arranged.
Species about 180 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Sori round, submarginal; indusia much reduced or usually absent. | distentifolium var. americanum |
1. Sori elongate or hooked, medial; indusia well developed. | A. filix-femina |
- Local floras:
CA, 
OR, 
WA - Local Web sites: CalFlora, CalPhotos,
Flora NW, 
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