Flora of North America species comparison

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Macrothelypteris torresiana

Mariana maiden fern, swordfern, Torres' fern
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.
Sori

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

sporangia with minute capitate glands near annulus.
Indument

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

rachis, costae, and blade tissue with capitate glands 0.05 mm.
2n

= 124.

Macrothelypteris torresiana
Habitat Terrestrial in damp woods and along stream banks
Elevation 0–100 m (0–300 ft)
Distribution
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]
[WildflowerSearch map]
[BONAP county map]
Discussion

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)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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