Adiantum - Adiantaceae

Adiantum mendoncae Alston

Photo: BT. Wursten
Zimbabwe

Photo: JE. Burrows
Zimbabwe

 

 

 

 

Synonyms

Common name

Description

Rhizome short, erect; rhizome scales dark brown. Fronds tufted, herbaceous. Stipe up to 15 cm long, dark brown, hairless except for narrow, hairlike scales towards the base. Lamina pinnate, narrowly lanceolate to oblong in outline; 30 × 5 cm, excluding a glabrous extension of the rhachis of varying length, which often ends in a proliferous bud or lamina with a terminal pinna. Rhachis, petiole and pinnae glabrous. Pinnae numerous (up to 20 pairs), broadly obcuneate to roughly obtriangular, with thin dark brown petiole up to 7 mm long, alternate; 2 × 1.4 cm, reduced in size towards the apex, margin of the sides entire, outer margin convex and finely toothed; venation flabellate. Sori on apices of the outer pinna margin, indusial flap short, dark brown,hairless.

Notes

A. mendoncae is pinnate, has a rhachis that is not hairy and long petiolules. It resembles and A. lunulatum, which has more semi-rounded pinnae with lobed margins. A. soboliferum has a stipe and rhachis that are winged.

Derivation

mendoncae: the plant was collected by Francisco d' Assensão Mendonça in Mozambique in 1942

Habitat

Terrestrial or lithophytic, shaded earth banks in ravines, cliff faces, around boulders, in riverine fringes or Brachystegia woodland.

Distribution worldwide

Only known from Zimbabwe and Mozambique

Distribution in Africa

Mozambique, Zimbabwe.

Growth form

Lithophytic, terrestrial.

Literature

  • Burrows, J.E. (1990) Southern African Ferns and Fern Allies. Frandsen, Sandton. Pages 120 - 122. (Includes a picture).
  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 226 - 227. (Includes a picture).
  • 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. (Includes a picture).
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