Pteris - Pteridaceae

Pteris intricata C.H. Wright

 

 

 

 

Synonyms

Pteris adamii Tardieu

Common name

Description

Rhizome up to 1.2 cm. in diameter, erect; rhizome-scales up to 1 cm. long, dark brown, linear-lanceolate in outline, margin entire. Stipe 63 cm long, 8 mm in diameter, light brown to castaneous, with sparse stout erect or recurved spines up to 3 mm. long, glabrous except for numerous scales similar to those on the rhizome about the base. Fronds tufted, arching, herbaceous. Lamina almost as broad as long, up to 1 x 0.9 m., ovate to broadly ovate in outline, 3–4-pinnatifid. Lowest pinnae up to 56 cm. long and developed basiscopically; pinnae narrowly triangular in outline, petiolate; the costae and costules of larger pinnae sparsely set with stout spines on the undersurface and with a spine at the junction of main veins on the upper surface; ultimate lobes c. 4 mm. broad, narrowly oblong to linear in outline, apex round to pointed, with the sterile margins of the fertile and sterile segments toothed, glabrous on both surfaces; veins free; rhachis and secondary rhachises castaneous, with sparse stout erect spines up to 2 mm. long. Sori linear, marginal in basal half of the segments; indusium entire, membranous.

Notes

This species can be recognized by a 2-pinnate lamina , free veins and a rhachis with stout spines.

Derivation

intricata: entangled, a reference to the much divided fronds.

Habitat

In evergreen swamp forest or riverside forest, on wet soils and in deep shade.

Distribution worldwide

Angola, Bioko, Burundi, Cameroon, Congo, DRC, Ghana, Guinea, Kenya, Madagascar, Mali, Mozambique, Nigeria, Rwanda, Sierra Leone, Tanzania, Uganda, Zambia.

Distribution in Africa

Angola, Burundi, Cameroon, Congo, Dem. Republic of Congo, Equatorial Guinea (incl. Bioko), Ghana, Guinea, Kenya, Mali, Mozambique, Nigeria, Rwanda, Sierra Leone, Tanzania , Uganda, Zambia.

Growth form

Terrestrial.

Literature

  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 238 - 239. (Includes a picture).
  • Kornas, J. (1979) Distribution and ecology of the Pteridophytes in Zambia. Polska Akademia Nauk Wydzial II Nauk Biologicznych. Page 70.
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 79.
  • 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 173.
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Page 117.
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