Isoetes - Isoetaceae

Isoetes stellenbossiensis A.V. Duthie

Photo: JE. Burrows
South Africa

 

 

 

 

Synonyms

Common name

Description

Pseudo-corm 3-lobed, harsh to touch; bud scales black, 3-toothed. Leaves 5-33, needle shaped, round in transverse section, 15-120 x 0.5-1 mm, flaring basally to form a wing up to 2 mm wide on either side of the sporangium. Ligule translucent, subulate to elongate-deltate, c. 2 mm long. Velum absent. Sporangia roughly oval, c. 2.5 x 2 mm. Megaspores 0.45-0.59 mm in diameter, white to greyish white when dry, shiny, distal surface clearly but shallowly reticulate, proximal surface reticulate but less regular and less clearly defined.

Notes

Derivation

stellenbossiensis: this species was first found in Stellenbosch Flats in Western Cape.

Habitat

Sandy soils in or around seasonally flooded depressions or pans, dying back in the dry summer.

Distribution worldwide

See African distribution.

Distribution in Africa

South Africa.

Growth form

Terrestrial.

Literature

  • Crouch, N.R., Klopper, R.R., Burrows, J.E. & Burrows, S.M. (2011) Ferns of Southern Africa, A comprehensive guide. Struik Nature. Pages 58 - 59. (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 10.
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