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Mariana maiden fern, swordfern, Torres' fern

macrothelypteris

Stems

short-creeping, thick, to 10 mm diam.

short-creeping, thick, 1 cm diam.

Leaves

monomorphic, evergreen, 60–150 cm.

Petiole

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

Blade(s)

2–3-pinnate, to ca. 85 cm.

2-pinnate-pinnatifid nearly throughout, broadest at base, apex gradually reduced;

pinnae pinnate-pinnatifid, sessile or stalked, not connected by wing along rachis;

costae not grooved adaxially;

buds absent;

veins free, often forked, tips not reaching margin;

rachises and costae lacking scales;

indument abaxially of unbranched, septate hairs mostly over 1 mm.

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.

round, medial to supramedial;

indusia small, less than 0.3 mm diam., often obscured in mature sori;

sporangial capsules bearing short-stalked glands.

Indument

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

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

x

= 31.

2n

= 124.

Macrothelypteris torresiana

Macrothelypteris

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]
from USDA
North America; Tropical and subtropical regions; Asia; Africa; Pacific Islands; Australia in Queensland
[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.)

Species ca. 10 (1 introduced in the flora).

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

Source FNA vol. 2. FNA vol. 2.
Parent taxa Thelypteridaceae > Macrothelypteris Thelypteridaceae
Subordinate taxa
M. torresiana
Synonyms Polystichum torresianum, Dryopteris uliginosa, Thelypteris torresiana, Thelypteris uliginosa Thelypteris section M., Thelypteris subg. M.
Name authority (Gaudichaud Beaupré) Ching: Acta Phytotax. Sin. 8: 310. (1963) (H. Itô) Ching: Acta Phytotax. Sin. 8: 308. (1963)
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