Inversodicraea cristata Engl., Veg. Erde 9(3, 1): 274 (1915)

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

7. Inversodicraea cristata Engl., Veg. Erde 9(3, 1): 274 (1915)

Ledermanniella cristata (Engl.) C.Cusset, Adansonia sér. 2, 14(2): 273 (1974)

Type.

Cameroon, near Malaka, Nov, Ledermann 1173 (lectotype: B).

Specimens examined.

Near Malaka, 500 m alt., Nov, Ledermann 1173, 1189 (U); Mari River waterfall, c. 8 km north of Betare Oya, 05 Feb 1966, Leeuwenberg 7761 (WAG, YA); in Mvigili, northwest of Moan, 24 km southeast of Nyabezan, Mar, J. & A. Raynal 10263 (P); Maan (24 km southeast of Nyabezan), rocky bank of Mvigili River, northwest of the village, 06 Mar 1963, J. & A. Raynal 10263 (P, YA).

Habitat.

River rapids.

Distribution.

Angola, Cameroon (Fig. 25 ), Central African Republic, Equatorial Guinea, Gabon.

Conservation status in Cameroon.

Inversodicraea cristata is listed on http://www.iucnredlist.org. The taxon was assessed globally as Vulnerable ( Ghogue 2017b). The species is known from five localities. The extent of occurrence of I. critata is about 73,144 km2 and the area of occupancy is about 24 km2. The main threats currently known from the localities are mining and agriculture. Based on these threats, and the continuous decline of vegetation cover in the area, extent and /or quality of habitat, I. cristata is currently assessed as Vulnerable IUCN Red List Category: Vulnerable VUB1+2ab (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.