Adiantum - Adiantaceae

Adiantum patens Willd. ssp. oatesii (Bak.) Schelpe

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

 

 

 

 

Synonyms

Adiantum oatesii Baker
Adiantum patens Willd. var. oatesii (Baker) F.Ballard
Adiantum pedatum Peter

Common name

Description

Rhizome creeping, short; rhizome scales 2 mm long, brown, slightly ciliate, tapering from the base to a sharp tip. Fronds tufted, herbaceous, arching. Stipe 10-40 cm long, thin, brown to black, glabrous. Lamina triangular in outline, 25 × 30 cm, pedately divided into up to 11 linear, pinnate pinnae, each terminating in a single apical pinnule. Rhachis hairless. Pinnules numerous, hairless, 15-25 -(30) × 0.7-10 mm, rhombic to broadly obcuneate in outline, stalkletss short wiry, brown, 1-3 mm long, upper and outer margins irregularly lobed, midrib forms the lower margin. Sori on pinnule lobes on the upper and outer margin of the undersurface, indusial flap circular to kidney-shaped, hairless, up to 2 mm in diameter.

Notes

A. patens is pedately divided. It can be distinguished from A. hispidulum var. hispidulum which is sparsely set with hairs on the undersurface of the pinnae and has narrowly tapering pinnae segments.

Derivation

patens: spreading, diverging from the axis at almost 90 degrees; referring to the fronds; oatesii:for Frank Oates (1840-1875), British naturalist and traveller who arrived in South Africa in 1873.

Habitat

Slopes, rock-clefts, shady paths and banks, around boulder bases in forest and on streamsides in riverine forest.

Distribution worldwide

Burundi, Cameroon, DRC, Ghana, Nigeria, Sudan, Tanzania, Uganda, Zambia, Zimbabwe

Distribution in Africa

Burundi, Cameroon, Democratic Republic of Congo, Ghana, Nigeria, Sudan and South Sudan, Tanzania , Uganda, Zambia, Zimbabwe.

Growth form

Terrestrial.

Literature

  • Burrows, J.E. (1990) Southern African Ferns and Fern Allies. Frandsen, Sandton. Pages 122 - 123. As A. oatesii (Includes a picture).
  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 227 - 228. As A. patens subsp. oatesii (Includes a picture).
  • Kornas, J. (1979) Distribution and ecology of the Pteridophytes in Zambia. Polska Akademia Nauk Wydzial II Nauk Biologicznych. Page 64. As A. patens subsp.oatesii
  • 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 70.
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 75.
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Page 111. As A. patens subsp. oatesii
  • Verdcourt, B. (2002) Adiantaceae. Flora of Tropical East Africa, Pages 58 - 59.
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