Crepidomanes inopinatum (Pic.Serm.) 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 : 20

7. Crepidomanes inopinatum (Pic.Serm.) J.P.Roux ( Roux 2001: 45) var. inopinatum , Fig. 10A

Vandenboschia inopinata Pic.Serm. ( Pichi Sermolli 1983: 245, 246). ≡ Trichomanes inopinatum (Pic.Serm.) J.E.Burrows ( Burrows 1990: 93). Type:—‘ Zaïre, dorsale ad ovest del Lago Kivu, montagne di Shamulamba’, 24 October 1953, R.E.G. Pichi Sermolli 4455 (holotype FI, FI-PS 19455; isotypes K, K000435648!; BR, BR0000008054661!).

= Trichomanes pyxidiferum L. ( Linné 1753: 1098) f. majus Taton ( Taton 1946: 34) Type:— DEMOCRATIC REPUBLIC OF CONGO. Ruwenzori, 14 may 1914, J.C.C. Bequaert 4245 (lectotype BR, BR0000008054494!, here designated); Ruwenzori, 13 May 1914, J.C.C. Bequaert 4231 (paralectotype BR, BR0000013204853!); Ruwenzori, 15 May 1914, J.C.C. Bequaert s.n. (paralectotype BR, BR0000013204877!); Ruwenzori, 15 May 1914, J.C.C. Bequaert s.n. (paralectotype BR, BR0000013204860!).

Short description—Epiphytic or lithophytic; long-creeping filiform rhizomes, rootless and densely covered by dense black trichomes, bearing widely separated pending fronds; fronds conspicuously stipitate, with wing on the upper part of the stipe (or with full winged stipes if short), up to 10(–15) cm long, lanceolate to ovate, pinnate-pinnatifid to bipinnate-pinnatifid with sometimes, when dry, folds parallel to veins; sori numerous, paratactic, mostly as long as wide, obconic to 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—Epiphytic on tree-trunks, or lithophytic on wet rocks usually near streams, in montane rainforests (1,200–1,500 m on La Réunion; up to 2,500 m in continental Africa) .

Specimens examined— LA RÉUNION. Without locality, 1832, J. N. Bréon s.n. ( P01522393 ) ; Without locality, May 1847, A. C. J. Bernier 907 ( P01522402 ) ; Without locality, 1892, E. J. de Cordemoy 133bis ( P00477827 ) ; Without locality, 1895, H. J. de Cordemoy s.n. ( P01522401 ) ; Bélouve , May 2002, E. Grangaud 978 ; Bébour , March 2003, E. Grangaud 1184 ; Bois Sans Souci , April 2003 ; E. Grangaud 1285. Note: The Grangaud’s specimens are available in the private collectionof the collector .

Note— Crepidomanes inopinatum var. inopinatum can easily be confused with Polyphlebium diaphanum , better known locally as P. borbonicum (Bosch) Ebihara & Dubuisson ( Ebihara et al. 2006: 240), which exhibits a similar gross morphology and can grow sympatrically (see Fig. 18A ). But as already reported by Dubuisson et al. (2013), C. inopinatum shows campanulate sori which are as long as wide, never significantly longer than wide (see Fig. 10B ), whereas P. diaphanum has clearly cylindrical sori that are always longer than wide and often up to twice as long as wide (see Fig. 18B ).

Figures

FIGURE 10. A. Crepidomanes inopinatum (Pic.Serm.) J.P.Roux var. inopinatum, as lithophyte (La Réunion, ‘Petite Plaine’). B. C. inopinatum var. tamonii Y.Robert & Dubuisson, habit (Y. Robert 913, P02433924). C. C. minutum (Blume) K.Iwats. var. minutum, as epiphyte (La Réunion, ‘Bébour’). D. C. minutum var. minutum, frond with long terete wingless stipe. E. C. minutum var. minutum, showing stipe proliferation, scale = 1 cm (from Madagascar, F. Rakotondrainibe 3698, P00085267). F. C. minutum var. mascarenense Pynee & Dubuisson, as epiphyte (La Réunion, ‘Grand Etang’). G. C. minutum var. mascarenense, detail of fronds with short stipes. (photographs. A: J.-Y. Dubuisson; C–D: C. Chaussidon; F–G: E. Grangaud).

FIGURE 18. A. Polyphlebium diaphanum (Kunth) Ebihara & Dubuisson, as epiphyte (La Réunion, ‘Forêt de Bon Accueil, Les Makes’). B. P. diaphanum, detail of a frond and sori. C. Vandenboschia gigantea (Bory ex Willd.) Pic.Serm., climbing on a tree trunk (La Réunion, ‘Mare Longue’). D. V. gigantea, terrestrial parts (La Réunion, ‘Grand Etang’). E. V. gigantea, detail of a long-creeping climbing rhizome (photographs.A: L. Bauret; B–E: J.-Y. Dubuisson).