12. Inversodicraea ntemensis (Y.Kita, Koi, Rutish. & M.Kato) J.J.Schenk, R.Herschlag & D.W.Thomas, Syst. Bot. 40(2): 542. (2015)

Ledermanniella ntemensis Y.Kita, Koi, Rutish. & M.Kato; Acta Phytotax. Geobot. 59: 224 (2008)

Type.

Cameroon, R. Imaichi Kita, Y. & J. P. Ghogue CMR 65 (YA). Basionym: Ledermanniella ntemensis Y.Kita, Koi, Rutish. & M.Kato; Acta Phytotax. Geobot. 59: 224 (2008).

Specimens examined.

South Region, Canon of Ntem, 30 km southwest of Nyabessan, 01 Dec 1982, Nkongmeneck 420 (YA); Ntem waterfalls, near Bongola, 40 km southeast of Campo, 10 Dec 1979, R. Letouzey 15333 (P, YA); Campo a’an area, Memve’ele waterfalls, 2°24'N, 10°21'E, 17 Jan 2002, P. Tchouto 3373 (K, KRI, SCA, WAG, YA).

Habitat.

Rapids of Ntem River.

Distribution.

Cameroon (Fig. 25).

Conservation status in Cameroon.

Inversodicraea ntemensis is not listed on http://www.iucnredlist.org. It was assessed in Onana and Cheek (2011) as Critically Endangered. The taxon is endemic to Cameroon and to the Ntem River. The extent of occurrence is about 4 km2, and the area of occupancy is about 4 km2. The main threat to the survival of the species is dam construction on Ntem River. The species is here reassessed and maintained as Critically Endangered. IUCN Red List Category: Critically Endangered CRB1+2ab (ii, iii).