The pollen grains consists two layers;
the outer exine and the
inner intine. The intine is a
uniform thin layer made up of pectolase which is destroyed during the acetolysis.
The exine is divided into two layers the
outer sculptured sexine and the
inner non-sculptured layer known as the
nexine. The exine which is capable of resistant to physical and biological degradation and
acetolysis. This helps the pollen grains to be
preserved for long periods of time in
fossil deposites.
