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Crouch, N.R., Klopper, R.R., Burrows, J.E. & Burrows, S.M. (2011) Ferns of Southern Africa, A comprehensive guide Struik Nature
Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria.
Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report 13
Schelpe, E.A.C.L.E. (1970) Pteridophyta Flora Zambesiaca
Aquatic ferns or found in swamps. Rhizome short, erect. Stipe thick, green, succulent. Fronds tufted, strongly dimorphic; fertile fronds larger, more dissected, bearing narrower linear segments than the sterile fronds; sterile fronds often proliferous. Veins anastomosing, without included veinlets. Sporangia sessile, borne along the veins beneath the reflexed lamina margin functioning as an indusium. Derivation of name: keras: horn, pteris: fern; an allusion to the staghorn-like shape of the fertile fronds. Worldwide: ± 4 species, pantropical distribution Botswana: 1 taxon. |
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