Ledermanniella thalloidea (Engl.) C.Cusset, Adansonia ser 2, 14(2): 275 (1974)

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

29. Ledermanniella thalloidea (Engl.) C.Cusset, Adansonia ser 2, 14(2): 275 (1974)

Inversodicraeia thalloidea Engl., Veg. Erde 9(3, 1): 274 (1915)

Type.

Cameroon, Ndoungue near Nkongsamba, Ledermann 6328a (lectotype: B; isotypes: BM, U). Basionym: Inversodicraeia thalloidea Engl., Veg. Erde 9(3, 1): 274 (1915).

Specimens examined.

Tributary of Sanaga, 10 km north of Edea, Kers 1904 (LISC); Ndoungue near Nkongsamba, 800 m alt., Ledermann 6328a (BM, U); Natchigal, Sanaga waterfall, A. & J. Raynal 10542 (P).

Habitat. River rapids and waterfalls in tropical rain forest.

Distribution.

Cameroon (Fig. 25 ).

Conservation status in Cameroon.

Ledermanniella thalloidea is listed on http://www.iucnredlist.org as Endangered ( Ghogue 2010k). However, Onana and Cheek (2011) assessed the taxon as Vulnerable. The taxon is endemic to Cameroon and known from two localities. The species’ area of occupancy is estimated to be less than 10 km2, and the extent of occurrence estimated at 18 km2. There is a decline in the quality of the habitat of the species; there is a dam at the Sanaga waterfalls, and another dam construction is in progress at the Nachtigal waterfalls, the two sites for the species. Due to the impact of the dams on the habitat of the species it is here reassessed as Critically Endangered. IUCN Red List Category: Critically Endangered CRB2ab (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.