Amauropelta - Thelypteridaceae

Amauropelta oppositiformis (C. Chr.) Holttum

 

 

 

 

Synonyms

Thelypteris oppositiformis (C. Chr.) Ching
Thelypteris strigosa sensu Schelpe

Common name

Description

Rhizome short erect; rhizome scales up to 4 mm long, brown, narrowly ovate, entire. Fronds tufted, erect to arching, not proliferous, herbaceous. Stipe up to 4 cm long, matt to dark brown, with minute white hairs. Lamina up to 60 × 15 cm, narrowly oblong-lanceolate to elliptic in outline, 2-pinnatifid, lower pinnae gradually reduced and widely spaced, lowest pinnae auriculate, reduced and reflexed. Pinnae narrowly oblong-lanceolate, up to 9 × 1.5 cm; upper surface with short, white hairs; lower surface subglabrous but with distinctive yellowish or reddish glands particularly along the veins and the costules. Ultimate lobes oblong, apex rounded to acute, margins entire; veins 6-7 pairs, not meeting the veins of the adjacent lobes. Rhachis pale brown, thinly set with minute pale hairs. Sori up to 8 per lobe; exindusiate or indusia small, with short white hairs, very quickly falling of.

Notes

A. bergiana resembles A. oppositiformis but has hooked hairs on lower surface of lamina and a minute indusium without glands but with minute hairs.
A. oppositiformis look for: straight hairs, golden to red glands on lower surface of lamina, exindusiate or indusia falling of early, basal pinnae gradually decrescent becoming increasingly auricled, veins of pinnae lobes not meeting below sinus.

Derivation

oppositiformis: formed opposite; refers to the opposite position of the pinnae.

Habitat

Along moist streambanks in montane grassland, full sun or shade.

Distribution worldwide

Distribution in Africa

Burundi, Cameroon, Dem. Republic of Congo, Ethiopia, Kenya, Malawi, Nigeria, Rwanda, South Africa, Sudan and South Sudan, Tanzania , Uganda, Zimbabwe.

Growth form

Terrestrial.

Literature

  • Burrows, J.E. (1990) Southern African Ferns and Fern Allies. Frandsen, Sandton. Page 270. As Thelypteris oppositiformis (C.Chr.) Ching (Includes a picture).
  • Crouch, N.R., Klopper, R.R., Burrows, J.E. & Burrows, S.M. (2011) Ferns of Southern Africa, A comprehensive guide. Struik Nature. Pages 698 - 699. (Includes a picture).
  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Page 384. (Includes a picture).
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 116.
  • 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 200.
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Page 193. As Thelypteris strigosa (Willd.) Tardieu
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