Marsilea - Marsileaceae

Marsilea aegyptiaca Willd.

 

 

 

 

Synonyms

Common name

Description

Floating form: stipe up to 30 cm long. Leaflets up to 25 × 17 mm, broadly obovate to broadly obdeltate, outer margin rounded, entire to shallowly sinuate, hairless, with brown interstitial streks below. Dry land form: stipe up to 4.5 cm long. Leaflets up to 10 × 7 mm, narrowly cuneate to broadly obdeltate, outer margins rounded to truncate, finaly set with long hairs. Sporocarps: usually in clusters of 2 or more, roughly square in lateral view, upper side straight, under side rounded, outer side rounded, lateral surfaces with a broad, somewhat curved, vertical furrow, oblong and grooved from the front; densely hairy when young becoming subglabrous with age; inferior tooth absent, superior tooth prominent, acute; pedicels up to 8 mm long, long, erect, twisted or straight, free, 2 or more arising from the axil of the stipe.

Notes

The sporocarps of M. aegyptiaca have a backward-facing lateral groove, this is not found in other Marsilea species from southern Africa.

Derivation

aegyptiaca: from Egypt, the species was first collected in Egypt.

Habitat

Arid semi-desert, growing along the margins of seasonal pans, pools and briefly flowing rivers.

Distribution worldwide

Africa, Madagascar and probably India.

Distribution in Africa

Algeria, Botswana, Egypt, Ethiopia, Libya, Morocco and Western Sahara, Namibia, Sudan and South Sudan, Tunesia.

Growth form

Aquatic, terrestrial.

Literature

  • Burrows, J.E. (1990) Southern African Ferns and Fern Allies. Frandsen, Sandton. Page 73. (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 242 - 243. (Includes a picture).
  • Jacobsen, W.B.G. (1983) The Ferns and Fern Allies of Southern Africa. Butterworths, Durban and Pretoria. Page 481. (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 55.
  • Roux, J.P. (2001) Conspectus of Southern African Pteridophyta. Southern African Botanical Diversity Network Report, 13 Page 174.
  • Schelpe, E.A.C.L.E. (1970) Pteridophyta. Flora Zambesiaca, 0 Pages 62 - 64. (Includes a picture).
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