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Phylogeny of Hymenophyllum subg. Mecodium (Hymenophyllaceae), with special focus on the diversity of the Hymenophyllum polyanthos species complex

  • Diego T. VasquesEmail author
  • Atsushi Ebihara
  • Regina Y. Hirai
  • Jefferson Prado
  • Ito Motomi
Original Article
  • 73 Downloads

Abstract

Hymenophyllum subg. Mecodium (Hymenophyllaceae) is represented by ca. 35 epiphytic species. Past reports suggest that Hymenophyllum polyanthos (Sw.) Sw., a pantropical species, does not represent a monophyletic grouping as it is recognized today. This research focuses on the H. polyanthos species complex, while comparing it to other species of subg. Mecodium using molecular and morphological traits. Here, chloroplast gene sequences of the atpB, atpB–rbcL–accD, rps4–trnS, and matK regions of 132 samples are compared under phylogenetic analyses and the resulting trees are discussed according to distributional and morphological differences. As a result, two big clades can be observed within Mecodium: one represented by plants distributed through Malesia, Australia, Pacific islands, Indian Ocean, and southern South America, and the other represented by plants occurring in Central and South America, Africa, and Asia. Hymenophyllum polyanthos samples appear interspersed in the phylogeny, evidencing its polyphyletic status. Main lineages identified here as H. polyanthos include: (1) plants from the Neotropics, closely related to species like H. myriocarpum Hook. and H. undulatum Sw., and probably representative of the type lineage for the species; (2) several independent lineages within the Asian samples; and (3) two distinct lineages distributed from Malesia and Pacific regions to South and Central America. The combination of distributional patterns and a morphological analysis of seven leaf traits suggests that these lineages are mostly sympatric and show a morphological variation that overlaps with each other.

Keywords

Hymenophyllaceae Hymenophyllum polyanthos Mecodium Plastid markers Polyphyletic species 

Notes

Acknowledgements

We acknowledge Drs. Joel Nitta (National Museum of Nature and Science, Japan) and Germinal Rouhan (Museúm National d’Histoire Naturelle, Paris) for initial suggestions and for providing us with samples to be included in our analysis. We confirm that the manuscript has been read and approved by all named authors and that there are no other persons who satisfied the criteria for authorship but are not listed. We further confirm that the order of authors listed in the manuscript has been approved by all of us. Finally, we confirm that there are no known conflicts of interest associated with this publication and there has been no significant financial support for this work that could have influenced its outcome.

Supplementary material

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Center of Global Communication Strategies, College of Arts and SciencesThe University of TokyoTokyoJapan
  2. 2.Department of BotanyNational Museum of Nature and ScienceTsukuba-shiJapan
  3. 3.Instituto de BotânicaSão PauloBrazil
  4. 4.Department of General System Studies, College of Arts and SciencesThe University of TokyoTokyoJapan

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