Thelypteris simulata |
Thelypteris nevadensis |
|
---|---|---|
bog fern, Massachusetts fern, thélyptère simulatrice |
Nevada Marsh fern, Sierra Marsh fern, Sierra wood fern |
|
Stems | long-creeping, 1.5–3 mm diam. |
creeping for 2–5 cm, then ascending or suberect, 1.5–3 mm diam. |
Leaves | monomorphic, dying back in winter, often 1 cm or more apart, fertile leaves often somewhat longer than sterile leaves, 25–80 cm. |
monomorphic, dying back in winter, tightly clustered, (25–)40–105 cm. |
Petiole | straw-colored above base, 12–45 cm × 1–3 mm, at base sparsely set with tan, ovate, glabrous scales. |
straw-colored, 3–20(–35) cm × 1–3 mm, at base with scales tan to reddish brown, ovate, glabrous. |
Blade | lanceolate, 14–35 cm, proximal pinnae largest, or lowest pair slightly smaller, blade tapered gradually to pinnatifid apex. |
elliptic, 20–70 cm, proximal 4–10 pinna pairs gradually reduced (smallest 5–20 mm), blade tapering gradually to pinnatifid apex. |
Pinnae | deeply pinnatifid to ca. 1 mm from costa, 3–10 × 1–2 cm; segments oblong, somewhat oblique, entire; proximal pair of veins from adjacent segments meeting margin above sinus. |
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, medial; indusia tan, often glandular; sporangia glabrous. |
round, supramedial; indusia tan, glabrous or short-ciliate, sometimes also with glands; sporangia glabrous. |
Indument | abaxially of sparsely set hairs 0.2–0.4 mm primarily on costae, also of yellowish short-stalked glands less than 0.1 mm, blade tissue with numerous reddish to orangish, resinous, shiny, sessile, hemispheric glands; blades adaxially with scattered hairs on veins. |
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 | = 128. |
= 54. |
Thelypteris simulata |
Thelypteris nevadensis |
|
Habitat | Terrestrial in acid soils of shaded swamps and bogs, frequently associated with sphagnum | Terrestrial in woods and meadows, especially near springs, seepage areas, and streams |
Elevation | 0–100 m (0–300 ft) | 0–1800 m (0–5900 ft) |
Distribution |
CT; DE; MA; MD; ME; NH; NJ; NY; PA; RI; VA; VT; WI; WV; NB; NS; ON; QC
|
CA; OR; WA; BC
|
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. | FNA vol. 2. |
Parent taxa | Thelypteridaceae > Thelypteris > subg. Parathelypteris | Thelypteridaceae > Thelypteris > subg. Parathelypteris |
Sibling taxa | ||
Synonyms | Aspidium simulatum, Parathelypteris simulata | Nephrodium nevadense, Dryopteris nevadensis, Dryopteris oregana, Parathelypteris nevadensis |
Name authority | (Davenport) Nieuwland: Amer. Midl. Naturalist 1: 226. (1910) | (Baker) Clute ex C. V. Morton: Amer. Fern J. 48: 139. (1958) |
Web links |
|