Crepidomanes bipunctatum (Poir.) Copel.

Ahamada H. Saïd, Sabine Hennequin, Germinal Rouhan & Jean-Yves Dubuisson, 2017, Disentangling the diversity and taxonomy of Hymenophyllaceae (Hymenophyllales, Polypodiidae) in the Comoros, European Journal of Taxonomy 313, pp. 1-53 : 11

Crepidomanes bipunctatum (Poir.) Copel.

Crepidomanes bipunctatum (Poir.) Copel., The Philippine Journal of Science 67: 59 (1938). – Trichomanes bipunctatum Poir., Encyclopédie méthodique, Botanique 8: 69 (1808). – Type: Madagascar, s. loc., s.d., L.­M.A. du Petit­Thouars s.n. (holo-: P00482602!; iso-: P00477821!, P00477823!).

Didymoglossum bipunctatum (Poir.) E.Fourn., Annales des Sciences naturelles, Botanique, sér. 5, 18: 263 (1873).

Hymenophyllum filicula Bory ex Willd. , Species plantarum: 528 (1810). – Type: ‘Habitat in sylvis insulae Mauritii, Borboniae’, s.d., J.B.G.M. Bory de St.­Vincent s.n. (holo-: BW20233010!; iso-: P00477824!).

Trichomanes filicula (Bory ex Willd.) Bory, Voyage autour du monde. Cryptogamie 6: 283 (1829).

Taschneria filicula (Bory ex Willd.) C.Presl, Abhandlungen der Königlichen Böhmischen Gesellschaft der Wissenschaften , ser. 5, 6: 618 (1851).

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 bipinnate-pinnatifid with false veins more or less continuous, parallel to the margin and not connected to true veins; sori numerous, paratactic, with obconic to campanulate base and triangular lips.

Global distribution

Western Indian Ocean to Pacific Ocean.

Distribution in Comoros

Anjouan, Grande Comore, Mayotte, Mohéli.

Additional specimens examined

COMOROS: ANJOUAN, s. loc., May 1850, L.H.Boivin s.n. (P0013962); s. loc., 1875, J.M.Hildebrandt 1850 (P00433461, P01331089, P01331092); s. loc., 1905, M.Lavanchie s.n. (P01331094). GRANDE COMORE, Forêt de la Grille, May 1850, L.H.Boivin s.n. (P01331087); s. loc., May 1963, J.Bosser 17981 (P00139618); Centre Sud, forêt dense au NE de Kourani, 24 Feb. 1975, J.J.Floret 914 (P00139622); Massif de La Grille, bord de la piste menant au pylône, 9 Nov. 2008, M.Pignal et al. 3511 (P02439797). MAYOTTE, Réserve forestière de Benara, Sommet du Bepilipili, 28 Nov. 2000, J.N.Labat et al. 3305 (P00220428); GR du Bénara près du chemin de crête, 22 Sep. 2001, M.Pignal et al. 1930bis (P00229663); Réserve forestière de Benara, 22 Aug. 2002, F.Barthelat 1000 (P00290459); E.Marie s.n. (P00139619); Massifs de Benara et de Bépilipili, Chemin de crête reliant les deux massifs, 9 Sep. 2002, F.Rakotondrainibe et al. 6650 (P00310477); Mavegani, s.d., E.Marie 191 (P00411765). MOHÉLI, Voundrouvou, Chalet Saint Antoine, 25 Nov. 1999, J.N.Labat et al. 3218 (P00184120); Piste entre Miringoni et le Chalet St Antoine, 4 Nov. 2008, G.Rouhan et al. 872 (P02439803), G.Rouhan et al. 882 (P02439805); Chalet St Antoine, 5 Nov. 2008, M.Pignal et al. 3475 (P02439794); Au-dessus de Drondroni, 26 Mar. 2011, C.Loup et al. 577 (P02439781).

Note

Among the four Crepidomanes taxa recognised in Comoros, the widespread C. bipunctatum is an easily distinguishable species. It displays typical lamina false veins more or less continuous and parallel to margins and the sorus lips are triangular (a unique feature for the Comorian Hymenophyllaceae ) (see Figs 2E , 3E ). This is also one of the only two Hymenophyllaceae species reported on all the four islands with Didymoglossum kirkii (see Table 2 ).

Figures

Fig. 2. Illustration of representative descriptors and states used in the Xper database (see Appendix 1). A. Hymenophyllum hirsutum (L.) Sw., typical bilabiate sori (S) without a developed base, fully hairy lamina with pedunculated brown trichomes (see inset). B. Didymoglossum robinsonii (Hook. ex Baker) Copel., false veins (FV) parallel but not connected to true veins (TV) and marginal dark trichomes clustered here by 6 (see inset). C. Crepidomanes inopinatum (Pic. Serm.) J. P. Roux, typical trichomanoid sori (S) with a developed tubular base, lips are here dilated as a collar. D. Didymoglossum rotundifolium (Bonap.) J. P. Roux, false veins (FV) parallel but not connected to true veins (TV) and continuous submarginal false vein (smFV), here the one-cell thick lamina appears well translucent. E. Crepidomanes bipunctatum (Poir.) Copel., false veins more or less continuous and parallel to margins (mFV) and not connected to true veins (TV). F. Hymenophyllum sibthorpioides (Bory ex Willd.) Mett. ex Kuhn, bilabiate sori (S) with toothed margins. Photographs by A. H. Saïd.

Fig. 3. Representative Comorian Hymenophyllaceae as observed in situ in rainforests (here from Grande Comore or Mohéli). A. Endemic Didymoglossum kirkii (Hook.) Ebihara & Dubuisson (G. Rouhan et al. 925, P 00684886). B. Hymenophyllum sibthorpioides (Bory ex Willd.) Mett. ex Kuhn (G. Rouhan et al. 888, P 02439806). C. Didymoglossum hildebrandtii (Kuhn) Ebihara & Dubuisson (M. Pignal et al. 3456, P 02439793). D. Hymenophyllum kuhnii C. Chr. (G. Rouhan 897, P 02439807). E. Crepidomanes bipunctatum (Poir.) Copel. (G. Rouhan et al. 882, P 02439805). F. Hymenophyllum hirsutum (L.) Sw. (M. Pignal et al. 3487, P 02439796). Photographs by G. Rouhan. Scale bars = 1 cm.