Crepidomanes fallax (Christ) Ebihara & Dubuisson

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 : 18

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 ).

Figures

FIGURE 9. A. Crepidomanes fallax (Christ) Ebihara & Dubuisson, as lithophyte on wet rock (La Réunion, ‘Rivière des Marsouins’). B. C. fallax, habit (from Madagascar, F. Rakotondrainibe 6467, P00248564). C. C. frappieri (Cordem.) J.P.Roux, covering a rock in a wet ravine (La Réunion, ‘Ravine Rivière Ste Anne’). D. C. frappieri, habit, type specimen (Bédier s.n., P00477825). E. C. frappieri, detail of long branched rhizome trichomes. F. C. frappieri, detail of sori (photographs.A, C & F: J.-M. Tamon).