Thelypteris dentata |
Thelypteris resinifera |
|
---|---|---|
downy maiden fern, downy shield fern, tapering tri-vein fern |
glandular maiden fern, resinous maiden fern, wax-dot maiden fern |
|
Stems | short-creeping, 4–6 mm diam. |
erect, (3–)5–12 mm diam. |
Leaves | often somewhat dimorphic, evergreen, often closely placed, 50–150 cm, fertile leaves with longer petioles and more contracted pinnae. |
monomorphic, evergreen, clustered, (15–)25–100(–135) cm; croziers often mucilaginous. |
Petiole | often purplish brown, 15–50 cm × 3–6 mm, at base with brown, linear-lanceolate, hairy scales. |
straw-colored, 2–15(–25) cm × 1–4(–6) mm, at base with brownish, ovate-lanceolate, ± glabrous scales. |
Blade | (25–)40–100 cm, 1–4(–6) proximal pairs of pinnae reduced, blade gradually tapered to pinnatifid apex. |
to 110 cm, proximally with 6–12 pairs of smaller pinnae, distally tapering gradually to a pinnatifid apex. |
Pinnae | 7–17 × 1–3 cm, incised 1/2–3/4 of width; segments rounded at apex, basal acroscopic segment of proximal pinnae often auriculate; proximal pair of veins from adjacent segments united at obtuse angle below sinus with excurrent vein 2–4 mm. |
|
Sori | round, medial to supramedial; indusia tan, pubescent, hairs 0.1–0.3 mm; sporangial stalks with orangish, stalked glands. |
round, medial to submarginal; indusia tan, glandular, and sparsely hairy. |
Indument | abaxially of uniformly short hairs 0.1–0.2 mm on costae, veins, and blade tissue; veins adaxially with stouter hairs, also with hairs 0.1–0.2 mm on blade tissue. |
abaxially of hairs 0.2–0.5 mm on rachises, costae, and sometimes veins and blade tissue, also of numerous glands, these yellowish to often reddish, resinous, shiny, sessile, hemispheric; blade tissue adaxially glabrous or sparsely hairy. |
Proximal | pinnae hastate or auriculate; longest (medial) pinnae 2–14(–20) × 0.4–2.5 cm, incised to within 1 mm of costa; segments 2–3 mm wide, strongly oblique and somewhat curved; veins meeting margin above sinus. |
|
2n | = 144. |
= 58. |
Thelypteris dentata |
Thelypteris resinifera |
|
Habitat | Damp woods | Damp woods and swamps in subacid soil |
Elevation | 0–100 m (0–300 ft) | 0–100 m (0–300 ft) |
Distribution |
AL; FL; GA; KY; LA; s Mexico; West Indies in the Antilles; South America to n Argentina; native to tropical and subtropical Asia; Africa [Introduced in North America] |
FL; Mexico; Central America; West Indies in the Greater Antilles; nw South America |
Discussion | Thelypteris dentata probably does not persist northward in areas (such as Kentucky) where winters are sometimes severe (R. Cranfill 1980). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 2. | FNA vol. 2. |
Parent taxa | Thelypteridaceae > Thelypteris > subg. Cyclosorus | Thelypteridaceae > Thelypteris > subg. Amauropelta |
Sibling taxa | ||
Synonyms | Polypodium dentatum, Christella dentata, Cyclosorus dentatus, Dryopteris dentata, Dryopteris mollis, T. reducta | Polypodium resiniferum, Amauropelta resinifera, Dryopteris panamensis, T. panamensis |
Name authority | (Forsskål) E. P. St. John: Amer. Fern J. 26: 44. (1936) | (Desvaux) Proctor: Bull. Inst. Jamaica, Sci. Ser. 5: 63. (1953) |
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