Dryopteris manniana (Hook.) C. Chr.
Synonyms |
Polypodium mannianum Hook. |
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Common name |
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Description |
Rhizome erect to suberect, up to 20 mm in diameter; rhizome scales brown, up to 22 x 3 mm, narrowly lanceolate in outline, margin entire with short marginal outgrowths. Fronds tufted, arching, 4-7 per plant, to 1 m long, herbaceous, with proliferating buds on the rhachis near the apex of the frond. Stipe up to 48 cm long, straw-coloured, with scales similar to, but smaller than rhizome scales, mostly at the base. Lamina up to 39 × 26 cm, ovate to ovate-oblong in outline, 2-pinnatifid at the apex to 3-pinnatifid at the base, with a pinnatifid to lobed terminal segment and basal pair of pinnae not reduced and basiscopically developed, proliferous. Pinnae, up to 12 pairs, stalked, narrowly ovate to oblong-acuminate towards lamina apex, basal pinnae up to 25 x 9.5 cm. Ultimate lobes oblong, apex rounded, margin shallowly lobed to toothed, upper surface hairless, lower surface sparsely set with hairs and scales up to 2 mm long along veins. Rhachis set with a few hairlike scales at the axils of the pinnae. Sori small, round, c. 1.5 mm in diameter, up to 18 per lobe, inframedial on vein branches; exindusiate. |
Notes | Can be separated from other species of Dryopteris by its gemmiferous fronds. |
Derivation | manniana: named after Gustav Mann, German botanist. |
Habitat | Shaded undergrowth of moist and riverine forests, often along streams. |
Distribution worldwide | Africa, Madagascar. |
Distribution in Africa |
Burundi, Cameroon, Equatorial Guinea (incl. Bioko), Guinea, Ivory Coast, Kenya, Liberia, Malawi, Mozambique, Nigeria, Rwanda, Sierra Leone, Tanzania , Uganda, Zimbabwe. |
Growth form |
Terrestrial. |
Literature |
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