Amblovenatum - Thelypteridaceae

Amblovenatum opulentum (Kaulf.) J.P.Roux






Amphineuron opulentum (Kaulf.) Holttum
Aspidium opulentum Kaulf.
Nephrodium wakefieldii Bak.
Thelypteris extensa (Bl.) Morton
Thelypteris opulenta (Kaulf.) Fosberg

Common name


Rhizome erect or short-creeping, branched; rhizome scales dark brown, apex gradually tapering to a point, margin minutely ciliate, ± 9 mm long. Fronds tufted, 0.9–0.5 m tall. Stipe 40–70 cm long, minutely set with short hairs and with scales at base. Lamina bipinnatifid, broadly oblong-ovate in outline, 0.8–1 x 0.6 m, the basal pinnae not or rarely reduced; largest pinnae narrowly oblong in outline, apex tapering to a point, 25–35(–40) x 2.5–2.9(–3.5) cm, hairy above on costa, with short hairs and yellow glands beneath (particularly along veins), deeply lobed; lobes narrowly oblong, oblique, slightly falcate, 1.2 x 4–5 mm; veins 8–10 pairs, the basal pair passing to sides of sinus-membrane or connivent or uniting below it forming a short excurrent vein. Sori coalescing to form lines parallel to lobe margins; indusia with small yellow glands on edges and often hairy (in extra-African material).




Evergreen forest on slopes, streamside in deep shade, Pandanus swamp with numerous calcareous outcrops.

Distribution worldwide

Africa (also Mozambique?), Chagos Archipelago, Seychelles, tropical Asia and Maleisia to N Queensland, eastwards to the Society Isl. and Marquesas.

Distribution in Africa

Kenya, Tanzania .

Growth form



  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Page 401.
  • Roux, J.P. (2009) Synopsis of the Lycopodiophyta and Pteridophyta of Africa, Madagascar and neighbouring islands. Strelitzia 23, South African National Biodiversity Institute, Pretoria. Page 201.
  • Verdcourt, B (2006) Thelypteridaceae.Flora of Tropical East Africa, Pages 36 - 37. As Amphineuron opulentum (Kaulf.) Holttum (Includes a picture).