NATIVEHabit: Rhizome creeping, 1.5--3 mm wide; generally dormant in winter.
Leaf: densely clustered, generally 40--100 cm, 8--15 cm wide; stipe scales ovate, tan, persistent; blade thin, abaxially with many short-stalked or sessile, resinous glands between and on veins, nonglandular hairs sparse on axes, veins, 0 between veins; pinnae deeply lobed, lobes +- oblong, entire to shallowly crenate.
Sporangia: sori small, round; indusia hairs 0 or sparse.
Ecology: Springy hillsides, seepage areas;
Elevation: 365--1700 m.
Bioregional Distribution: KR, NCoRO, n SNH;
Distribution Outside California: to British Columbia, Idaho.
Note: Locally forming large colonies. Differs from
Athyrium filix-femina in having longer, thinner rhizome, thinner leaves, more numerous reduced proximal pinnae, more entire lobes, rounder sori.
Synonyms: Lastrea oregana (C. Chr.) Copel.; Parathelypteris nevadensis (Baker) Holttum
Jepson eFlora Author: John C. Game, Alan R. Smith & Thomas Lemieux
Reference: Smith & Cranfill 2002 Amer Fern J 92:131--149
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)
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