Adiantum lindsaeoides (Pteridaceae), a New Fern Species from the Atlantic Rain Forest, Brazil

Abstract—

Adiantum lindsaeoides (Pteridaceae) is a new fern species from the Atlantic Rain Forest, on the coast of Brazil. It can be recognized by the nodose rhizomes, stipes approximate, dense indument of short hairs on both sides of the stipes and rachises, plus scattered, slightly tortuous, filiform scales, and by its median segments conspicuously falcate, and dimidiate that resemble the segments of a Lindsaea. The most similar species to A. lindsaeoides is A. mynsseniae that differs by having rhizomes not nodose, stipes apart, stipes and rachises glabrous abaxially, and segment apices long-acuminate to acute (vs. round in A. lindsaeoides). So far, A. lindsaeoides is only known from Bahia and Espírito Santo States. The new species is described and illustrated, and, a key to the most similar morphological species is given.