Macrothelypteris torresiana

(Gaudichaud-Beaupré) Ching

Acta Phytotax. Sin. 8: 310. 1963.

Common names: Torres's fern Mariana maiden fern
Basionym: Polystichum torresianum Gaudichaud-Beaupré Voy. Uranie 8: 333. 1828
Synonyms: Dryopteris uliginosa (Kunze) C. Christensen Thelypteris torresiana (Gaudichaud-Beaupré) Alston Thelypteris uliginosa (Kunze) Ching
Treatment appears in FNA Volume 2.
Revision as of 14:21, 20 January 2022 by GeoffLevin (talk | contribs) (Restored hyphen in Gaudichaud-Beaupré to match printed version)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Stems short-creeping, thick, to 10 mm diam. Leaves monomorphic, evergreen, 60–150 cm. Petiole to 75 cm × 3–12 mm, glaucous when living. Blade 2–3-pinnate, to ca. 85 cm. Pinnae to 35 × 10(–17) cm; pinnules sessile to adnate, oblique, 2–8 × 0.8–2.5 cm, incised almost to costule into oblique segments 2–4 mm wide, segments entire to dentate or pinnatifid; veins forked or simple. Indument abaxially of septate hairs 1–2 mm on costae and costules; rachis, costae, and blade tissue with capitate glands 0.05 mm. Sori round, indusia small, less than 0.3 mm diam., glabrous or glandular; sporangia with minute capitate glands near annulus. 2n = 124.

Habitat: Terrestrial in damp woods and along stream banks
Elevation: 0–100 m


V2 240-distribution-map.gif

Introduced; Ala., Ark., Fla., Ga., La., Miss., S.C., Tex., s Mexico, West Indies in the Antilles, Central America, South America to n Argentina, native to tropical and subtropical Asia, Africa.


The name Dryopteris setigera (Blume) Kuntze has been misapplied to plants in the flora.

Selected References


Lower Taxa

Alan R. Smith +
(Gaudichaud-Beaupré) Ching +
Polystichum torresianum +
Torres's fern +  and Mariana maiden fern +
Ala. +, Ark. +, Fla. +, Ga. +, La. +, Miss. +, S.C. +, Tex. +, s Mexico +, West Indies in the Antilles +, Central America +, South America to n Argentina +, native to tropical and subtropical Asia +  and Africa. +
0–100 m +
Terrestrial in damp woods and along stream banks +
Acta Phytotax. Sin. +
Introduced +  and Illustrated +
Dryopteris uliginosa +, Thelypteris torresiana +  and Thelypteris uliginosa +
Macrothelypteris torresiana +
Macrothelypteris +
species +