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. 2013 Sep 4;4:345. doi: 10.3389/fpls.2013.00345

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Copyright © 2013 Vasco, Moran and Ambrose.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Parallelism in four simple-leaved ferns belonging to different families. (A) Lindsaea cyclophylla (Lindsaeaceae). (B) Adiantum reniforme (Pteridaceae). (C) Trichomanes reniforme (Hymenophyllaceae). (D) Schizaea elegans (Schizaeaceae).