Thelypteris nevadensis |
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Nevada Marsh fern, Sierra Marsh fern, Sierra wood fern |
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Stems | creeping for 2–5 cm, then ascending or suberect, 1.5–3 mm diam. |
Leaves | monomorphic, dying back in winter, tightly clustered, (25–)40–105 cm. |
Petiole | straw-colored, 3–20(–35) cm × 1–3 mm, at base with scales tan to reddish brown, ovate, glabrous. |
Blade | elliptic, 20–70 cm, proximal 4–10 pinna pairs gradually reduced (smallest 5–20 mm), blade tapering gradually to pinnatifid apex. |
Pinnae | 3–10 × (0.6–)1–2 cm, deeply pinnatifid to within 1 mm of costa; segments oblong to linear, oblique (sides slanted, not perpendicular to costa), entire to crenulate; proximal pair of veins from adjacent segments meeting margin above sinus. |
Sori | round, supramedial; indusia tan, glabrous or short-ciliate, sometimes also with glands; sporangia glabrous. |
Indument | abaxially of sparsely set hairs 0.2–0.7 mm on rachises, costae, and sometimes veins, also of numerous orangish, sessile to usually short-stalked glands on blade tissue; blades adaxially glabrous except along costae. |
2n | = 54. |
Thelypteris nevadensis |
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Habitat | Terrestrial in woods and meadows, especially near springs, seepage areas, and streams |
Elevation | 0–1800 m (0–5900 ft) |
Distribution |
CA; OR; WA; BC
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Discussion | Thelypteris nevadensis is named for the Sierra Nevada and, contrary to its common name, is not found in Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 2. |
Parent taxa | Thelypteridaceae > Thelypteris > subg. Parathelypteris |
Sibling taxa | |
Synonyms | Nephrodium nevadense, Dryopteris nevadensis, Dryopteris oregana, Parathelypteris nevadensis |
Name authority | (Baker) Clute ex C. V. Morton: Amer. Fern J. 48: 139. (1958) |
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