Crepidomanes bonapartei (C.Chr.) J.P.Roux

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 : 16-18

4. Crepidomanes bonapartei (C.Chr.) J.P.Roux ( Roux 2009: 39), Fig. 8D, E

Trichomanes bonapartei C.Chr. ( Christensen 1920: 14, 15), as ‘ bonapartii ’. ≡ Gonocormus bonapartei (C.Chr.) Copel. ( Copeland 1938: 101). Type:— MADAGASCAR. ‘Région floristique du Centre. Massif de Manongarivo.’, without date, H. Perrier de la Bâthie 7745 (holotype P, P00466425!).

Short description—Epiphytic or lithophytic; long-creeping filiform rhizomes, rootless and densely covered by dense black trichomes, bearing widely separated pending fronds; fronds subsessile or with short stipes with wide wings broaden towards the apex, up to 4 cm long, lobed to mostly pinnatifid, rarely flabellate, never with laminar folds parallel to veins; sori few, paratactic, obconic to campanulate with a very slightly dilated mouth ( Fig. 8E ); receptacle mostly included, sometimes exerted.

Global distribution— Madagascar and Mascarenes.

Current distribution in Mascarenes— La Réunion, Mauritius (see note below).

Ecology—Epiphytic or lithophytic on shady wet rocks, mostly near streams, in lowland rainforests and wet ravines (150–650 m), and also one reported population in a wet ravine of the La Réunion western side in semi-dry forest remnants.

Specimens examined— MAURITIUS. Tamarind Falls, March 1975, D. Lorence 1134 (MAU 0012282).

— LA RÉUNION. Mare Longue , April 1999, J.- Y. Dubuisson HR1999-5 ’ ( P) ; Mare Longue , April 2003, J.- Y. Dubuisson HR2003-7 ( P) .

Note—As reported by Dubuisson et al. (2013), this dwarf species can be confused in the field and in collections with C. minutum (Blume) K.Iwats. and C. trinerve (Baker) Dubuisson & Ebihara ( Dubuisson et al. 2013: 187), both taxa presented below. Contrary to these two species, C. bonapartei has subsessile fronds or short winged stipes, and never displays laminar folds parallel to veins. The species is known in Mauritius from a single herbarium specimen (see above), pending new observations on the island.

Figures

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).