Asplenium - Aspleniaceae

Asplenium aethiopicum (Burm. f.) Bech. [aggregate]

Photo: P. Ballings
Mozambique

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Mozambique

Photo: P. Ballings
Mozambique

Photo: P. Ballings
Zimbabwe

 

 

 

 

Synonyms

Asplenium adiantoides Lam.
Asplenium furcatum Thunb.
Trichomanes aethiopicum Burm.f.
Asplenium gueinzianum Mett. ex Kuhn
Asplenium praemorsum sensu Sim
Asplenium schelpei Braithwaite

Common name

Description

Rhizome shortly creeping or ascending, up to 7 mm thick. Rhizome scales 3-7 x 0.3-0.6 mm, linear to narrowly triangular in outline, apex tapering to a point, dark brown to blackish, entire or with a few hair-like outgrowths, ending in hair-point. Fronds tufted to shortly spaced, not proliferous. Stipe 4-40 cm long, dark brown to blackish, covered with hair-like scales when young, subglabrous with age except near the base. Lamina very variable in size, shape and degree of dissection, 8-64 cm × 2.5-27 cm, strongly 2-pinnatifid to 3-pinnate, ovate to narrowly lanceolate in outline with the basal pair or 2 of pinnae occasionaly reduced in size. Pinnae ovate to narrowly lanceolate in outline, apex acute, sometimes drawn out into a thin, narrow terminal segment, base unequally cuneate, margins irregularly toothed. Pinnules upper surface subglabrous, lower surface sparsely set with twisted scales. Sori linear, 2.5-14 mm long, set along flabellate veins, sori more than one per lobe, indusium narrowly linear, membraneous, subentire, 0.3-0.5 mm wide.

Notes

The extreme variability of this species makes it difficult to distinguish it from others in this group. A. aethiopicum has recently been split up in 4 subsp.(J.P.Roux,2001). We have lumped these for the time being. These subspecies usually grade from one to the other and are hard to distinguish without a strong microscope to examen the spores.

Derivation

aethiopicum: of Ethiopia, a historic name for large parts of Africa

Habitat

Wide variety of habitats, deciduous woodland, high altitude mist forest, riverine forest, evergreen coastal forest. Terrestrial, epiphytic or lithophytic.

Distribution worldwide

Throughout tropical Africa and to South Africa, Comoro islands, Mauritius, Madagascar.

Distribution in Africa

Angola, Burundi, Cameroon, Central African Republic, Congo, Democratic Republic of Congo, Djibouti, Equatorial Guinea (incl. Bioko), Eritrea, Ethiopia, Gabon, Guinea, Kenya, Lesotho, Liberia, Malawi, Mozambique, Nigeria, Rwanda, Sierra Leone, Somalia, South Africa, Sudan and South Sudan, Swaziland, Tanzania , Uganda, Zambia, Zimbabwe.

Growth form

Epiphytic, lithophytic, terrestrial.

Literature

  • Beentje, H.J. (2008) Aspleniaceae. Flora of Tropical East Africa, Pages 58 - 59. (Includes a picture).
  • Burrows, J.E. (1990) Southern African Ferns and Fern Allies. Frandsen, Sandton. Pages 246 - 248. (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 646 - 649. (Includes a picture).
  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 361 - 362. (Includes a picture).
  • Kornas, J. (1979) Distribution and ecology of the Pteridophytes in Zambia. Polska Akademia Nauk Wydzial II Nauk Biologicznych. Pages 94 - 95.
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 160.
  • 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 76 - 77.
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Pages 181 - 182.
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