Comparison of molecular and morphological data on St Helena: Elaphoglossum |
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Authors: | Antonia Eastwood Quentin C B Cronk Johannes C Vogel Andreas Hemp Mary Gibby |
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Institution: | (1) Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh, EH3 5LR, UK;(2) Botany Department, Natural History Museum, Cromwell Road, London, SW7 5BD, UK;(3) Botanical Garden and Centre for Plant Research, University of British Columbia, 6804, SW Marine Drive, Vancouver, British Columbia, Canada;(4) Department of Plant Systematics, University of Bayreuth, 95440 Bayreuth, Germany |
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Abstract: | The endemic elaphoglossoid ferns, Elaphoglossum dimorphum, E. nervosum and Microstaphyla furcata of St Helena, form a closely related group within section Lepidoglossa when analysed phylogenetically using sequences from the chloroplast trnL intron (partial) and trnL-F intergenic spacer. Microstaphyla furcata, traditionally placed in its own genus, is clearly shown to belong to Elaphoglossum confirming the previous transfer of this species to Elaphoglossum as E. bifurcatum. There is hardly any trnL-F sequence divergence between the species, in fact sequences of E. nervosum and E.
dimorphum are identical. These results are consistent with the possible origin of E. dimorphum as a hybrid between E. bifurcatum and E. nervosum or with the view that the three species are the result of a recent radiation. The potential conflict between phylogenetic and morphological distinctness in determining species conservation priorities is discussed. |
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Keywords: | Elaphoglossum Microstaphyla St Helena phylogeny morphological divergence conservation priorities trnL intron trnL-F spacer molecular systematics Lomariopsidaceae ferns |
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