Thelypteris dentata

(Forsskål) E. P. St. John

Amer. Fern J. 26: 44. 1936.

Common names: Downy maiden fern downy shield fern tapering tri-vein fern
Basionym: Polypodium dentatum Forsskål Fl. Aegypt.-Arab., 185. 1775
Synonyms: Christella dentata (Forsskål) Brownsey & Jermy Cyclosorus dentatus (Forsskål) Ching Dryopteris dentata (Forsskål) C. Christensen Dryopteris mollis (Swartz) Hieronymus Thelypteris reducta Small
Treatment appears in FNA Volume 2.

Stems short-creeping, 4–6 mm diam. Leaves often somewhat dimorphic, evergreen, often closely placed, 50–150 cm, fertile leaves with longer petioles and more contracted pinnae. Petiole often purplish brown, 15–50 cm × 3–6 mm, at base with brown, linear-lanceolate, hairy scales. Blade (25–)40–100 cm, 1–4(–6) proximal pairs of pinnae reduced, blade gradually tapered to 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. 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. Sori round, medial to supramedial; indusia tan, pubescent, hairs 0.1–0.3 mm; sporangial stalks with orangish, stalked glands. 2n = 144.

Habitat: Damp woods
Elevation: 0–100 m


V2 707-distribution-map.gif

Introduced; Ala., Fla., Ga., Ky., La., s Mexico, West Indies in the Antilles, South America to n Argentina, native to tropical and subtropical Asia, Africa.


Thelypteris dentata probably does not persist northward in areas (such as Kentucky) where winters are sometimes severe (R. Cranfill 1980).

Selected References


Lower Taxa

... more about "Thelypteris dentata"
Alan R. Smith +
(Forsskål) E. P. St. John +
Polypodium dentatum +
Downy maiden fern +, downy shield fern +  and tapering tri-vein fern +
Ala. +, Fla. +, Ga. +, Ky. +, La. +, s Mexico +, West Indies in the Antilles +, South America to n Argentina +, native to tropical and subtropical Asia +  and Africa. +
0–100 m +
Damp woods +
Amer. Fern J. +
Introduced +  and Illustrated +
Christella dentata +, Cyclosorus dentatus +, Dryopteris dentata +, Dryopteris mollis +  and Thelypteris reducta +
Thelypteris dentata +
Thelypteris subg. Cyclosorus +
species +