Aleuritopteris - Sinopteridaceae

Aleuritopteris farinosa (Forssk) Fée

Photo: BT. Wursten
Zimbabwe

Photo: P. Ballings
Malawi

Photo: BT. Wursten
Zimbabwe

Photo: BT. Wursten
Zimbabwe

Photo: P. Ballings
Malawi

Photo: P. Ballings
Malawi

Photo: P. Ballings
Malawi

Photo: P. Ballings
Malawi

 

 

 

 

Synonyms

Cheilanthes farinosa (Forssk.) Kaulf.
Pteris farinosa Forssk.
Allosorus farinosus (Forssk.) C.Presl.
Cassebeera farinosa (Forssk.) J.Sm.
Aleuritopteris afra Pic. Serm.
Aleuritopteris aethiopica Saiki
Pteris decursiva Forssk.

Common name

Description

Rhizome erect to shortly creeping, up to 10 mm in diameter; rhizome scales ovate to lanceolate in outline, 7-10.5 mm in length, dark-brown to golden, margins pale, entire, apex often gland-tipped and with marginal glands. Fronds 3-20, tufted, erect or arching, up to 40(-120) cm long, herbaceous or thinly coriaceous. Stipe 5-55 cm long, black to castaneous, shiny; stipe scales confined to lower part or sometimes scattered, 4-13 x 1.6-4(-6) mm, mostly very narrowed to hair-tip, brown to golden. Lamina 2 to 3-pinnatifid, lanceolate to narrowly ovate in outline, 12-54 × 5-18 cm; pinnae 5-25 pairs, lanceolate or narrowly triangular in outline, lower pinnae more or less basiscopically developed, upper pinnae decurrent, 0.5-12 x 0.2-5 cm, glabrous, dark matt green above, covered with a white or sometimes pale, yellow powder beneath; ultimate lobes linear-oblong to lanceolate in outline, apex rounded, margins minutely toothed; rhachis, costae, costules shiny black and glabrous. Sori small, marginal, in discrete or continuous clusters; indusium small, semi-transparent, entire to variously lacerate.

Notes

The powdery underside makes it easy to distinguish this fern from other species. A. welwitschii has creeping rhizome and a brown stipe.

Derivation

farinosa: mealy, referring to the powdery substance on the undersurface of the leaves.

Habitat

In various forest communities, woodland, streamsides, swampy areas, roadside banks, ravines, steep wet rock slopes and lava cliffs, mossy rocks, open grassland in spray of waterfalls.

Distribution worldwide

Africa, Comoro Isl., Madagascar, Réunion, Oman, Saudi Arabia, Socotra, Yemen.

Distribution in Africa

Angola, Botswana, Burundi, Cameroon, Dem. Republic of Congo, Djibouti, Equatorial Guinea (incl. Bioko), Eritrea, Ethiopia, Guinea, Kenya, Malawi, Nigeria, Rwanda, Sierra Leone, Somalia, Sudan and South Sudan, Tanzania , Uganda, Zambia, Zimbabwe.

Growth form

Epiphytic, lithophytic, terrestrial.

Literature

  • Burrows, J.E. (1990) Southern African Ferns and Fern Allies. Frandsen, Sandton. Page 128. As Cheilanthes farinosa. (Includes a picture).
  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 247 - 248. As Cheilanthes farinosa. (Includes a picture).
  • Kornas, J. (1979) Distribution and ecology of the Pteridophytes in Zambia. Polska Akademia Nauk Wydzial II Nauk Biologicznych. Pages 47 - 48. As Cheilanthes farinosa.
  • 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 179.
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 68. (Includes a picture).
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Page 122. As Cheilanthes farinosa.
  • Verdcourt, B. (2002) Adiantaceae. Flora of Tropical East Africa, Pages 28 - 32. As cheilanthes farinosa. (Includes a picture).
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