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5. Campyloneurum C. Presl, Tent. Pterid. 189. 1836.

Strap ferns [Greek kampylos, curved, and neuron, nerve, in reference to the venation]

Clifton E. Nauman

Plants epiphytic. Stems short- to long-creeping, branched, 2--10 mm diam., sometimes whitish pruinose; scales brown, ovate, often clathrate, entire. Leaves monomorphic, tufted, conspicuously narrowed to tip, to 150 cm. Petiole absent or present, articulate to stem. Blade linear to lanceolate or elliptic, simple, glabrous, sparsely scaly, margins entire; scales clathrate, basifixed. Primary veins connected by 1--several secondary veins (cross veins), forming 1--several areoles between each pair of primary veins, areoles with 1--4 excurrent veinlets, sometimes these excurrent veinlets dividing areoles completely. Sori in 1--10 rows between midrib and margin, terminal on included veinlets, discrete, round; indument absent. Spores verrucose to nearly psilate. x = 37.

Species ca. 25--50 (4 in the flora): tropical, North America, Mexico, West Indies, Central America, South America.


Eaton, A. A. 1906. Pteridophytes observed during three excursions into southern Florida. Bull. Torrey Bot. Club 33: 455--486. Lellinger, D. B. 1988. Some new species of Campyloneurum and a provisional key to the genus. Amer. Fern J. 78: 14--34.

1 Primary veins obscure and slightly to strongly curved; blades generally less than 6 cm wide.   (2)
+ Primary veins conspicuous and straight to slightly curved; blades generally more than 6 cm wide.   (3)
2 (1) Blades more than 2 cm wide, margins shallowly sinuate to undulate, not revolute; areoles in 4–8 series between costa and margin; petioles always present.   1 Campyloneurum costatum
+ Blades less than 2 cm wide, margins revolute, not shallowly sinuate to undulate; areoles in 1–4 series between costa and margin; petioles present or absent.   2 Campyloneurum angustifolium
3 (1) Petioles absent to ca. 9 cm; blades yellow-green, margins entire and plane to lightly undulate.   3 Campyloneurum phyllitidis
+ Petioles 5–18 cm; blades dark green, margins undulate.   4 Campyloneurum latum

Lower Taxa


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