Pityrogramma - Pteridaceae

Pityrogramma calomelanos (L.) Link var. aureoflava (Hook.) Weath. ex L.H. Bailey

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

Photo: P. Ballings
Zimbabwe

 

 

 

 

Synonyms

Gymnogramma calomelanos (L.) Kaulf. var. aureoflava Hook.
Ceropteris calomelanos sensu Sim

Common name

Description

Rhizome erect to shortly creeping, up to 10 mm in diameter; scales light brown, linear, up to 4 mm long, margins entire. Fronds tufted, arching, firmly herbaceous. Stipe 6-36 cm long, black to chestnut brown, shiny smooth with few scales at the base. Lamina 14-37 × 7-14 cm, ovate to lanceolate in outline, 2- to 3-pinnatifid, long tapering to the apex. Pinnae oblong-lanceolate to narrowly lanceolate, pinnatifid to varying degree, apices acute, margins shallowly toothed and inrolled in dried material, dark green above and covered with a yellow powder below, glabrous on both surfaces. Rhachis black to chestnut brown, shiny, glabrous. Sori about 3 mm long, situated along the veins in the outer half of the lamina between the costule and margin, often difficult to see because of the yellow powder; exindusiate.

Notes

First record for Zimbabwe!!!
Could be confused with P. argentea but the latter has more delicate and more divided (3- or 4-pinnatifid, broadly ovate to triangular fronds.

Derivation

calomelanos: beautifully black, referring to the colour of stipe and rhachis; aureoflava: golden yellow, the undersides of the lamina are covered with yellow powder.

Habitat

In crack of rocks of artificial cliff caused by old mining activity, in full sun

Distribution worldwide

Native of South and Central America but naturalised in DRC, South Africa, Swaziland, Zambia, Comoro Islands, Mauritius, Australia. Now also found in Zimbabwe.

Distribution in Africa

Democratic Republic of Congo, South Africa, Swaziland, Zambia, Zimbabwe.

Growth form

Lithophytic, terrestrial.

Literature

  • Burrows, J.E. (1990) Southern African Ferns and Fern Allies. Frandsen, Sandton. Pages 116 - 117. (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 314 - 315. (Includes a picture).
  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Pages 222 - 223.
  • Kornas, J. (1979) Distribution and ecology of the Pteridophytes in Zambia. Polska Akademia Nauk Wydzial II Nauk Biologicznych. Pages 61 - 62.
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 57.
  • 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 177 - 178.
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Pages 107 - 108.
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