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giant sword fern

Stem

scales loosely appressed to spreading, concolored or bicolored with pale margins.

Leaves

2–22 × 0.3–3.5 dm.

Petiole

0.2–5.4 dm, sparsely to moderately scaly;

scales spreading, reddish to light brown throughout (rarely with pale margins).

Blade

sparsely to densely scaly, glabrous or pubescent, hairs mostly on veins and abaxial, pale to light brown, 0.2–0.7 mm.

Indusia

circular to horseshoe-shaped, peltate or attached at narrow sinus, 0.8–1.1 mm wide.

Tubers

absent.

Rachis

1.8–17 dm, points of pinna attachment 7.5–35 mm apart;

scales moderately spaced, pale brown throughout.

Central

pinnae narrowly deltate to narrowly elliptic-lanceolate, 2.5–23 × 0.5–2 cm, base cuneate, truncate to auriculate-cordate acroscopically, rounded basiscopically, acroscopic lobe small and oblong or absent, margins biserrate to serrulate, apex attenuate;

costae adaxially glabrous or densely hairy, hairs erect, pale, 0.3 mm.

2n

= 82.

Nephrolepis biserrata

Habitat Terrestrial or less commonly epiphytic in forested, relatively wet habitats, e.g., swamps, but occasionally thickets, roadsides, or clearings
Elevation 0 m (0 ft)
Distribution
from FNA
FL; Mexico; Central America; South America; West Indies; Africa; se Asia
Discussion

Some forms of Nephrolepis biserrata closely resemble N. multiflora in pinna shape and indument but lack the distinctively transparent-margined (i.e., bicolored) and persistent petiole scales of the latter species. Nephrolepis multiflora also has more appressed and darker-colored stem scales.

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

Source FNA vol. 2.
Parent taxa Dryopteridaceae > Nephrolepis
Sibling taxa
N. cordifolia, N. exaltata, N. multiflora, N. ×averyi
Synonyms Aspidium biserratum
Name authority (Swartz) Schott: Gen. Fil. plate 3. (1834)
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