Pollen and translators were obtained from flowers rehydrated
in 3% phosphate-buffered glutaraldehyde. For light microscopy
the pollen was acetolysed according to the method of Erdtman
(1960), mounted in glycerine jelly and sealed with paraffin wax.
A minimum of 15 pollen tetrads were examined for every
specimen. Measurements were made with a light microscope.
For scanning electron microscopy (SEM), pollen was acetolysed,
air-dried on stubs, coated with gold and examined with a
Jeol Winsem 6400 microscope at 5 kV (Centre for Microscopy,
University of the Free State). The translators were mounted on
stubs with double-sided tape, coated with gold and examined