A global phylogeny of Stegnogramma ferns (Thelypteridaceae): generic and sectional revision,historical biogeography and evolution of leaf architecture |
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| Authors: | Li-Yaung Kuo Yi-Hang Chang Yu-Hsuan Huang Weston Testo Atsushi Ebihara Germinal Rouhan Luis G. Quintanilla James E. Watkins Jr. Yao-Moan Huang Fay-Wei Li |
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| Affiliation: | 1. Boyce Thompson Institute, Ithaca, NY, 14853 USA;2. Taiwan Forestry Research Institute, Taipei, 10066 Taiwan;3. Biology Department, University of Florida, Gainesville, FL, 32611 USA;4. Department of Botany, National Museum of Nature and Science, Amakubo 4-1-1, Tsukuba, Ibaraki, 305-0005 Japan;5. Institut de Systématique, Evolution, Biodiversité (ISYEB), Muséum National d'Histoire Naturelle, CNRS, EPHE, Sorbonne Université, 16 rue Buffon CP39, F-75005 Paris, France;6. School of Environmental Sciences and Technology, Rey Juan Carlos University, Móstoles, Spain;7. Department of Biology, Colgate University, Hamilton, NY, 13346 USA;8. Boyce Thompson Institute, Ithaca, NY, 14853 USA Plant Biology Section, Cornell University, Ithaca, NY, 14853 USA |
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| Abstract: | The thelypteroid fern genus Stegnogramma s.l. contains around 18–35 species and has a global, cross-continental distribution ranging from tropical to temperate regions. Several genera and infrageneric sections have been recognized previously in Stegnogramma s.l., but their phylogenetic relationships are still unclear. In this study, we present a global phylogeny of Stegnogramma s.l. with the most comprehensive sampling to date and aim to pinpoint the phylogenetic positions of biogeographically and taxonomically important taxa. Based on the reconstructed historical biogeography and character evolution, we propose a new (infra)generic classification and discuss the diversification of Stegnogramma s.l. in a biogeographical context. New names or combinations are made for 12 (infra)species, including transferring the monotypic species of Craspedosorus to Leptogramma. Finally, we discuss a possible link between leaf architecture and ecological adaptation, and hypothesize that the increase in leaf dissection and free-vein proportion is an adaptive feature to cool climates in Stegnogramma s.l. |
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