Actiniopteris - Pteridaceae

Actiniopteris radiata (J. Konig ex Sw.) Link

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

 

 

 

 

Synonyms

Actiniopteris australis sensu Sim
Asplenium radiatum J.König ex Sw.
Acrostichum radiatum (J.König ex Sw.) Poir.
Pteris radiata (J.König ex Sw.) Bojer

Common name

Description

Rhizome shortly creeping, c. 4 mm in diameter; rhizome scales narrowly triangular, pale brown with a central dark stripe, 3-3.5 mm long. Stipe pale brown to strawcoloured, subglabrous with few brown hairlike scales. Fronds densely tufted, erect, weakly dimorphic, differing only in size and stipe length not in shape and degree of lamina dissection. Lamina flabellate, semi-circular in outline, dried lamina bent over sharply at an angle of 90° or more with the stipe. Sterile frond: stipe 2-10 cm long, lamina 1.5-4.5 cm long, dichotomously divided into 20-60 linear segments, segments apices serrate with 2-5 teeth, margins entire, usually reflexed. Fertile frond: stipe 5.5-20 cm long, lamina 3-7 cm long, otherwise similar to sterile lamina. Sori in submarginal lines, partly obscured by reflexed margin; indusium continuous.

Notes

Can be confused with Actiniopteris dimorpha. A. dimorpha is strongly dimorph, fertile and sterile fronds differing in size and stipe length, as well as in shape or degree of lamina dissection. A. dimorpha also has about half the number of segments on the fertile frond.

Derivation

radiata: describing the radiating arrangement of the segments of the lamina.

Habitat

Dry rocky outcrops, in rock crevices, at base of boulders, on shallow soil overlying sheetrock, earth banks in shaded ravines.

Distribution worldwide

Africa and eastwards through Arabia to India and Sri Lanka.

Distribution in Africa

Angola, Benin, Botswana, Democratic Republic of Congo, Djibouti, Egypt, Ethiopia, Kenya, Malawi, Mozambique, Namibia, Nigeria, Somalia, South Africa, Sudan and South Sudan, Swaziland, Tanzania , Togo, Uganda, Zambia, Zimbabwe.

Growth form

Lithophytic, terrestrial.

Literature

  • Burrows, J.E. (1990) Southern African Ferns and Fern Allies. Frandsen, Sandton. Page 180. (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 306 - 307. (Includes a picture).
  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 291 - 292. (Includes a picture).
  • Kornas, J. (1979) Distribution and ecology of the Pteridophytes in Zambia. Polska Akademia Nauk Wydzial II Nauk Biologicznych. Pages 46 - 47.
  • Roux, J.P. (2009) Synopsis of the Lycopodiophyta and Pteridophyta of Africa, Madagascar and neighbouring islands. Strelitzia 23, South African National Biodiversity Institute, Pretoria. Pages 167 - 168.
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 59. (Includes a picture).
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Page 138. (Includes a picture).
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