Bolbitis fluviatilis (Hook.) Ching, Index Filic. Suppl. Tert. 48 (1934)

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

Bolbitis fluviatilis (Hook.) Ching, Index Filic. Suppl. Tert. 48 (1934)

Acrostichum fluviatile Hook., Sp. Fil. 5: 274 (1864)

Acrostichum phanerodictyon Baker, Bol. Soc. Brot. 4: 156, t. 2 (1886)

Leptochilus fluviatilis (Hook.) C.Chr., Index Filic. 10, 385 (1905)

Type.

Equatorial Guinea, Fernando Po (Bioko), G. Mann 442 (K, K000435773).

Description.

Herbaceous, rhizome creeping, with opaque, castaneous scales; fixed to rocks by roots; sterile fronds lanceolate, up to 85 cm long; fertile fronds up to 90 cm long with sporangia on lower surface.

Specimens examined.

15 km southeast of Zingui, 14 Mar 1968, R. Letouzey 9031 (YA); near Ababendoman, 65 km southeast of Ebolowa, 00 Jan 1970, R. Letouzey 9958 (YA); Muanenguba Mts. northeast of Nkongsamba, 4°58'N, 9°53'E, 11 Dec 1971, A. J. M. Leeuwenberg 8848 (YA).

Habitat.

Rocky riverbeds and streams, and rocky borders of streams and rivers; in evergreen rainforest.

Distribution.

Cameroon (Fig. 2 ), Democratic Republic of Congo, Gabon, Ghana, and Liberia.

Conservation status in Cameroon.

Bolbitis fluviatilis is not listed on http://www.iucnredlist.org nor in Onana and Cheek (2011). The species is currently known from five localities. The extent of occurrence (EOO) is more than 20,000 km2, and the area of occupancy (AOO) is about 20 km2. Some collecting localities of the species are within the Cameroon Development Corporation (CDC) palm tree plantations, and other localities are proposed for plantation development. Based on this threat, extent and/or quality of the habitat of the species B. fluviatilis is here assessed as Endangered. IUCN Red List Category: Endangered ENB2ab (ii, iii).

Figures

Figures 2 - 10. 2 Bolbitis fluviatilis (Hook.) Ching 3 Bolbitis heudelotii (Bory ex Fee) Alston 4 Lepidagathis alopecuroides R. Br. ex Griseb. 5 Achyranthes talbotii Hutch & Daziel 6 Crinum natans Baker 7 Kanahia laniflora (Forssk.) R. Br. 8 Anubias barteri Schott 9 Cyperus rheophyticus Lye 10 Cyperus tonkinensis C. B. Clarke var. baikiei (C. B. Clarke ex Kuk) S. S. Hooper.