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 14. Didymoglossum lorencei (Tardieu) Ebihara & Dubuisson ( Ebihara et al. 2006: 236 ), Fig. 12B–D Trichomanes lorencei Tardieu ( Tardieu-Blot 1977: 147 , pl. 1, t. 7–13). Type:— MAURITIUS . Valley Cascade, March 1975 , D. Lorence 1175 ( holotype P, P00477828!). Short description—Epiphytic or lithophytic; long-creeping filiform rhizomes, rootless and densely covered by dense black trichomes, bearing widely separated pending fronds; fronds sessile to sub-sessile, up to 1.5 cm long, oblong to obovate, entire with entire to undulate margins, with palmate venation and false veins parallel to true veins, hairy with dark, not pedonculated trichomes on lamina margins ( Fig. 12D ); a single terminal sorus per fertile frond, cylindrical with lips usually parallel and with brown margins; receptacle usually covered by the lips.. Global distribution—Western Indian Ocean (excl. Seychelles ). Current distribution in Mascarenes— La Réunion , Mauritius . Ecology—Epiphytic on tree-trunks or lithophytic on shaded, wet rocks in lowland rainforests ( 150–550 m ) and also one reported population in a wet ravine of the western side of La Réunion in remnants of semi-dry forest. Specimens examined— MAURITIUS . Vallée de Ferney, October 2010 , S. Hennequin et al. 400 (MAU, P02432468) — LA RÉUNION . Brûlé de Takamaka, June 2006 , E. Grangaud 1752 (P01627307), October 2010 , S. Hennequin et al. 309 (P02432362). Note—This rare dwarf species can be confused in the wild with D. barklyanum , but clearly shows false veins parallel to true veins, absent in the latter species. Genus Hymenophyllum Sm. (Smith 1793: 418) Subgenus Hymenophyllum