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Mariana maiden fern, swordfern, Torres' fern


short-creeping, thick, to 10 mm diam.


monomorphic, evergreen, 60–150 cm.


to 75 cm × 3–12 mm, glaucous when living.


2–3-pinnate, to ca. 85 cm.


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.


round, indusia small, less than 0.3 mm diam., glabrous or glandular;

sporangia with minute capitate glands near annulus.


abaxially of septate hairs 1–2 mm on costae and costules;

rachis, costae, and blade tissue with capitate glands 0.05 mm.


= 124.

Macrothelypteris torresiana

Habitat Terrestrial in damp woods and along stream banks
Elevation 0–100 m (0–300 ft)
from FNA
AL; AR; FL; GA; LA; MS; SC; TX; s Mexico; Central America; West Indies in the Antilles; South America to n Argentina; native to tropical and subtropical Asia; Africa [Introduced in North America]
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The name Dryopteris setigera (Blume) Kuntze has been misapplied to plants in the flora.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 2.
Parent taxa Thelypteridaceae > Macrothelypteris
Synonyms Polystichum torresianum, Dryopteris uliginosa, Thelypteris torresiana, Thelypteris uliginosa
Name authority (Gaudichaud Beaupré) Ching: Acta Phytotax. Sin. 8: 310. (1963)
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