Nephrolepis exaltata

(Linnaeus) Schott

Gen. Fil. plate 3. 1834

Common names: Sword fern wild Boston fern
Basionyms: Polypodium exaltatum Linnaeus Syst. Nat. ed. 10, 2: 1326. 1759
Treatment appears in FNA Volume 2.
Click plate for higher resolution version.
Illustrator: John Myers
Stem scales spreading, concolored. Tubers absent. Leaves 4–15 × 0.5–1.2 dm. Petiole 0.2–4 dm, sparsely to moderately scaly; scales spreading, pale brown to reddish brown, concolored. Blade glabrous, sparsely to moderately scaly abaxially near costae and adaxially. Rachis 2.4–16.3 dm, points of pinna attachment 7.3–21 mm apart; scales moderately spaced, pale to dark brown, essentially concolored or margin indistinctly paler; hairs absent. Central pinnae deltate-oblong, slightly to distinctly falcate, 2.3–7.4 × 0.6–1.8 cm, base truncate to truncate-auriculate or auriculate, occasionally overlapping rachis, acroscopic lobe deltate to acute, margins serrulate, apex acute to deltate; costae adaxially glabrous. Indusia reniform to horseshoe-shaped, attached at narrow or broad sinus, 1–1.7 mm wide.

Habitat: Terrestrial or epiphytic in forested to open habitats, most often as an epiphyte
Elevation: 0 m

Distribution

V2 594-distribution-map.gif

Fla., West Indies, Pacific Islands in scattered locations.

Discussion

Nephrolepis exaltata is occasionally found farther north in the flora, but only as an escape from cultivation. Nephrolepis exaltata is usually confused with N. cordifolia when sterile; the latter species can be distinguished by its distinctly bicolored, adaxial rachis scales. These bicolored scales will distinguish N. cordifolia from all of the other species, even in the absence of other key features.

References

None.

Lower Taxa

No lower taxa listed.