Disentangling the diversity and taxonomy of Hymenophyllaceae (Hymenophyllales, Polypodiidae) in the Mascarene archipelago, with ecological implications Author Dubuisson, Jean-Yves Institut de Systématique, Evolution, Biodiversité (ISYEB), Sorbonne Université - SU, MNHN, CNRS, EPHE, 57 rue Cuvier, CP 48, 75005 Paris, France. Author Pechon, Timothée Le Institut de Systématique, Evolution, Biodiversité (ISYEB), Sorbonne Université - SU, MNHN, CNRS, EPHE, 57 rue Cuvier, CP 48, 75005 Paris, France. & Botanic Garden Meise, Nieuwelaan 38, 1860 Meise, Belgium Author Bauret, Lucie Institut de Systématique, Evolution, Biodiversité (ISYEB), Sorbonne Université - SU, MNHN, CNRS, EPHE, 57 rue Cuvier, CP 48, 75005 Paris, France. & Institut de Systématique, Evolution, Biodiversité (ISYEB), Muséum national d’Histoire naturelle, CNRS, Sorbonne Université, EPHE, 57 rue Cuvier, CP 39, 75005 Paris, France. Author Rouhan, Germinal Institut de Systématique, Evolution, Biodiversité (ISYEB), Muséum national d’Histoire naturelle, CNRS, Sorbonne Université, EPHE, 57 rue Cuvier, CP 39, 75005 Paris, France. Author Reeb, Catherine Institut de Systématique, Evolution, Biodiversité (ISYEB), Sorbonne Université - SU, MNHN, CNRS, EPHE, 57 rue Cuvier, CP 48, 75005 Paris, France. Author Boucheron-Dubuisson, Elodie Institut de Systématique, Evolution, Biodiversité (ISYEB), Sorbonne Université - SU, MNHN, CNRS, EPHE, 57 rue Cuvier, CP 48, 75005 Paris, France. Author Selosse, Marc-André Institut de Systématique, Evolution, Biodiversité (ISYEB), Muséum national d’Histoire naturelle, CNRS, Sorbonne Université, EPHE, 57 rue Cuvier, CP 39, 75005 Paris, France. & Department of Plant Taxonomy and Nature Conservation, University of Gdansk, Wita Stwosza 59, 80 - 308 Gdansk, Poland. Author Chaussidon, Cécile Institut de Systématique, Evolution, Biodiversité (ISYEB), Sorbonne Université - SU, MNHN, CNRS, EPHE, 57 rue Cuvier, CP 48, 75005 Paris, France. Author Dajoz, Isabelle Institut d’Ecologie et des Sciences de l’Environnement de Paris (iEES), Univ. Paris Diderot, Sorbonne Université, CNRS, INRA, IRD, UPEC, 4 place Jussieu, CC 237, 75252 Paris cedex 05, France. Author Pynee, Kersley The Mauritius Herbarium, Agricultural Services, Agronomy Division, Ministry of Agro-Industry and Food Security, Réduit, Mauritius. Author Grangaud, Edmond 21, les Cytises - Terre-Sainte, 97410 Saint-Pierre, La Réunion, France. Author Robert, Yannis Association des Naturalistes de Bourbon, 18 rue des capucines, 97431 Plaine des Palmistes, La Réunion, France. Author Tamon, Jean- Maurice Association des Naturalistes de Bourbon, 18 rue des capucines, 97431 Plaine des Palmistes, La Réunion, France. Author Hennequin, Sabine Institut de Systématique, Evolution, Biodiversité (ISYEB), Sorbonne Université - SU, MNHN, CNRS, EPHE, 57 rue Cuvier, CP 48, 75005 Paris, France. text Phytotaxa 2018 2018-11-09 375 1 1 58 http://dx.doi.org/10.11646/phytotaxa.375.1.1 journal article 10.11646/phytotaxa.375.1.1 1179-3163 13727979 5. Crepidomanes fallax (Christ) Ebihara & Dubuisson ( Ebihara et al. 2006: 238 ), Fig. 9A, B Trichomanes fallax Christ ( Christ 1909a: 24 , 25). ≡ Vandenboschia fallax (Christ) Copel. ( Copeland 1938: 52 ). Type:— DEMOCRATIC REPUBLIC OF CONGO . Route de Zobia à Buta, 10 May 1907 , F. Seret 863 ( holotype BR, BR0000008054333!; isotype P, P00064997!). Trichomanes latilobum Bonap. ( Chevalier 1920: 755 ), nom. nud. Intended type :—‘ Côte d’Ivoire-Bassin du Haut-Nuon, pays des Dyolas, entre Sempleu et Ganhoué’, without date, A. Chevalier 21140 (not located). Short description—Epiphytic or lithophytic; long-creeping filiform rhizomes, rootless and densely covered by dense black trichomes, bearing widely separated pending fronds; fronds well stipitate with widely winged stipe and rachis ( Fig. 9B ), up to 10(–15) cm long, narrowly elliptic to lanceolate, less often oblong, pinnatifid to pinnate-pinnatifid; sori few to numerous, paratactic, as long as to longer than wide, campanulate with a slightly dilated mouth; receptacle short to long-exerted. Global distribution—Central Africa to western Indian Ocean. Current distribution in Mascarenes— La Réunion . Ecology—Lithophytic on shady wet rocks, mostly near streams(on La Réunion , elsewhere noted mostly epiphytic), in lowland rainforests and wet ravines ( 300–550 m ). Specimens examined— LA RÉUNION . Rivière des Marsouins, September 1979 , T. Cadet 4426 (P01526283, P01526284, P01526285). Note—This species is more or less widespread (but rare) in wet tropical Africa and Madagascar , and is quite rare on the Mascarenes, only present in a few localities (especially ravines) on the eastern side of La Réunion . It can easily be distinguished from other Mascarenan Crepidomanes by its widely winged stipe and rachis ( Fig. 9B ).