In this paper three new species of Lindsaea Dryand. ex Sm. are described and
illustrated from South America: falcatosora A. Rojas, L. nana A. Rojas and L.
trapezoidalis A. Rojas. The first species differ from L. pleioptera Kramer by its
falcate pinnae (in 1-pinnate fronds) or pinnules (in 2-pinnate fronds) with falcate
sori restricted to 2/3 basal, or absent in 1/3 apical where the blade is dentate.
The second species differ from L. falcata Dryand. by its smaller blades (4.5–8 ×
1.7–2.6 cm vs. 10–25 × 4–7.5 cm), pinnae perpendicular to slightly ascending
(vs. falcate) and apical segment subconform (vs. conform), deltate (vs. hastate).
The third species differ from L. taeniata Kramer by its angulate (vs. terete) stipe
and rachises and proportionally shorter (2-3.5 times longer than wide vs. at
least 5 times longer than wide) pinnules. Also three varietals are combined as
species.
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