Nephrolepis biserrata |
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giant sword fern |
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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 |
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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 |
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 | |
Sibling taxa | |
Synonyms | Aspidium biserratum |
Name authority | (Swartz) Schott: Gen. Fil. plate 3. (1834) |
Web links |