Ledermanniella onanae Cheek, Kew Bull. 58: 733 (2003)

Kuetegue, Felix, Sonke, Bonaventure & Ameka, Gabriel K., 2019, A checklist of rheophytes of Cameroon, PhytoKeys 121, pp. 81-131 : 81

23. Ledermanniella onanae Cheek, Kew Bull. 58: 733 (2003)

Type.

Cameroon, Bakossi Mts, northwest of Muambong, 04 Feb 1998, J.-M. Onana 558 (K, YA).

Specimens examined.

Cameroon: South West Province, Bakossi Mts., Chide River falls, northwest of Muambong, 04 Feb 1998, J.-M. Onana 558 (YA, K); South West Province, Bakossi Mts., Ndip River rapids between Nzimbeng and Kodmin, alt. 1150 m. fl. & fr., 14 Feb 1998, M. Cheek 9196 (K, YA).

Habitat.

Perennial waterfalls and river rapids in submontane forest.

Distribution.

Cameroon (Fig. 25 ) and Gabon.

Conservation status in Cameroon.

Ledermanniella onanae is listed on http://www.iucnredlist.org as globally Endangered ( Ghogue 2010g). Onana and Cheek (2011) maintained the Endangered status. The taxon is known from three localities, two of which are on the same river. The extent of occurrence of L. onanae is about 23,751 km2 and the area of occupancy is about 12 km2. The main threats currently known from the localities are forest logging and agriculture. Based on these threats, and the continuous decline of vegetation cover in the area, extent and /or quality of habitat, L. onanae is currently reassessed and the Endangered status maintained. IUCN Red List Category: Endangered ENB2ab (iii).

Figures

Figures 20 - 25. 20 Ixora inundata Hiern 21 Virectaria angustifolia (Hiern) Bremek 22 Virectaria salicoides (C. H. Wright) Bremek 23 Deinbollia angustifolia D. W. Thomas 24 Deinbollia saligna Keay 25 Podostemaceae distribution.