Crepidomanes bipunctatum (Poir.) Copel.

Dubuisson, Jean-Yves, Pechon, Timothée Le, Bauret, Lucie, Rouhan, Germinal, Reeb, Catherine, Boucheron-Dubuisson, Elodie, Selosse, Marc-André, Chaussidon, Cécile, Dajoz, Isabelle, Pynee, Kersley, Grangaud, Edmond, Robert, Yannis, Tamon, Jean- Maurice & Hennequin, Sabine, 2018, Disentangling the diversity and taxonomy of Hymenophyllaceae (Hymenophyllales, Polypodiidae) in the Mascarene archipelago, with ecological implications, Phytotaxa 375 (1), pp. 1-58 : 16

3. Crepidomanes bipunctatum (Poir.) Copel. ( Copeland 1938: 59), Fig. 8A–C

Trichomanes bipunctatum Poir. ( Poiret 1808: 69). ≡ Didymoglossum bipunctatum (Poir.) E.Fourn. ( Fournier 1873: 263). Type:— MADAGASCAR. ‘De Madagascar’, without date, L.-M.A. du Petit-Thouars s.n. (lectotype P, P00482602!, here designated; isolectotypes P, P00477821!, P00477823!).

= Hymenophyllum filicula Bory ex Willd. (Willdenow 1810: 528). ≡ Trichomanes filicula (Bory ex Willd.) Bory (Bory 1829: 283). ≡ Taschneria filicula (Bory ex Willd.) C.Presl (Presl 1851: 618). Type:—‘In insula Mauritii, Borbonia’, without date, J.B.G.M. Bory de St.-Vincent s.n. (lectotype B, BW 20 233010!, here designated; isolectotype P, P00477824!).

= Trichomanes bilabiatum Nees & Blume (von Blume & Nees 1823: 123, 124). ≡ Crepidomanes bilabiatum (Nees & Blume) Copel. ( Copeland 1938: 59). Type:—JAVA. Without locality, without date, without collector (holotype Nova Acta Phys.-Med. Acad. Caes. Leop.-Carol. Nat. Cur. (1823): Plate XIII, Fig. 2 ).

Short description—Epiphytic or less often lithophytic; long-creeping filiform rhizomes, rootless and densely covered by dense black trichomes, bearing widely separated pending fronds; fronds with fully winged stipes, up to 12 cm long, lanceolate to ovate, less often triangular, pinnate-pinnatifid to bi-pinnate-pinnatifid with false veins more or less continuous, parallel to the margin and not connected to true veins ( Fig. 8B ); sori numerous, paratactic, with obconic to campanulate base and triangular lips ( Fig. 8C ); receptacle usually covered by the lips.

Global distribution—Western Indian Ocean to Pacific Ocean.

Current distribution in Mascarenes— La Réunion, Mauritius.

Ecology—Epiphytic on tree-trunks, less often lithophytic, in lowland rainforests (50–850 m).

Representative specimens examined— MAURITIUS. Rambouillet, April 2011, K. Pynee s.n. ( MAU 0008203 ) ; Tamarind Falls , May 2011, K. Pynee et al. s.n. ( MAU 0008262 ) ; Trou aux Cerfs, July 2015, K. Pynee et al. s.n. ( MAU 0008301 ) ; Bar Le Duc , August 2011, K. Pynee et al. s.n. ( MAU 0008303 ) ; Brise Fer CMA, October 2010, S. Hennequin et al. 346 ( MAU 0009477 ) ; Macabé , October 2010, S. Hennequin et al. 343 ( MAU 0017487 ) .

— LA RÉUNION. Mare Longue , April 1999, J.- Y. Dubuisson HR-1999-3 ( P) ; Mare Longue , March 2005, T. Janssen et al. 2693 ( P00590808 ) .

Note—This species is distinguishable from other Crepidomanes species in the archipelago by the combination of the more-or-less continuous false-veins parallel to the margins, and the typical triangular sorus lips.

Figures

FIGURE 2. Wet Mascarenan ecosystems. A. Lowland windward rainforest dominated by Sapotaceae trees, showing the understory with numerous low epiphytic and terrestrial free-sporing plants (liverworts, mosses, ferns, lycopods and spikemosses) and a few herbaceous angiosperms (especially orchids) (La Réunion, ‘Mare Longue’ forest, ~450 m). B. Montane rainforest dominated by Dombeyoideae (Malvaceae) trees and Alsophila spp. tree-ferns (Cyatheaceae) as emergents from the canopy (La Réunion, ‘Cassé de Takamaka, Bébour’, 1,100–1,200 m). C. Montane ericoid thickets (La Réunion, ‘Enclos du Piton de la Fournaise’, ~2,200 m). (Photographs. A, C: C. Chaussidon; B: J.-M. Tamon).

FIGURE 8. A. Crepidomanes bipunctatum (Poir.) Copel., as epiphyte on a tree-trunk (Mauritius, ‘Bar le Duc’). B. C. bipunctatum, detail of segments with false veins parallel to the margins (fv). C. C. bipunctatum, sori (s) with triangular lips. D. C. bonapartei (C.Chr.) J.P.Roux, as lithophyte on wet rock (La Réunion, ‘Grand Etang’). E. C. bonapartei, detail of subsessile or short-stipitate fronds and one sorus (photographs.A: J.-Y. Dubuisson; B–C: L. Bauret; D–E: E. Grangaud).