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Type: Article
Published: 2017-11-10
Page range: 201–222
Abstract views: 15
PDF downloaded: 2

Taxonomic study of the fern genera Abrodictyum C.Presl and Trichomanes L. (Hymenophyllaceae, Polypodiidae) in the western Indian Ocean, and description of a new Abrodictyum species for Madagascar

Institut Systématique Evolution Biodiversité (ISYEB), Sorbonne Universités, UPMC Univ Paris 06, MNHN, CNRS, EPHE, 57 rue Cuvier, CP48, 75005 Paris, France.
Institut Systématique Evolution Biodiversité (ISYEB), Sorbonne Universités, UPMC Univ Paris 06, MNHN, CNRS, EPHE, 57 rue Cuvier, CP48, 75005 Paris, France. Institut Systématique Evolution Biodiversité (ISYEB), Sorbonne Universités, MNHN, CNRS, UPMC, EPHE, Herbier National, 57 rue Cuvier, CP39, 75005 Paris, France.
Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AE, United Kingdom.
Island Biodiversity & Conservation Centre, associated with the University of Seychelles, Anse Royale, Mahé, P.O. Box 1348, Seychelles. Evolutionary Biology & Ecology - CP 160/12, Université Libre de Bruxelles, 50 Av. F. Roosevelt, 1050 Bruxelles, Belgium.
Institut Systématique Evolution Biodiversité (ISYEB), Sorbonne Universités, MNHN, CNRS, UPMC, EPHE, Herbier National, 57 rue Cuvier, CP39, 75005 Paris, France.
The Mauritius Herbarium, Agricultural Services, Agronomy Division, Ministry of Agro-Industry and Food Security, Réduit, Mauritius.
Department of Botany, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, 305-0005, Japan
Institut Systématique Evolution Biodiversité (ISYEB), Sorbonne Universités, UPMC Univ Paris 06, MNHN, CNRS, EPHE, 57 rue Cuvier, CP48, 75005 Paris, France.
Abrodictyum Trichomanes taxonomy western Indian Ocean Pteridophytes

Abstract

Recent studies on both genera Abrodictyum and Trichomanes (Hymenophyllaceae) in western Indian Ocean (Madagascar and neighbouring islands) resolved many taxonomic problems and led to the identification of new species. We propose here to finalize the taxonomic revision of both genera for the region, by completing and combining an expanded rbcL molecular phylogeny with morphological investigations and field observations on all the recognized species. Our results confirm the distinction of the supposedly six species of Abrodictyum and three species of Trichomanes. They also reveal the polyphyly of the highly polymorphic A. meifolium. Additional investigations on A. meifolium suggest the existence of at least two distinct taxa: the true highly variable and widespread A. meifolium which is renamed A. parviflorum comb. nov. and the newly described A. cylindratum sp. nov. restricted to Madagascar. A key and updated descriptions (including new diagnostic characters for A. tamarisciforme) are provided for the seven Abrodictyum and three Trichomanes species present in the western Indian Ocean.