50 

 AZOLLA: 





Fig. 85. Azolla filiciiloides, microspores. From above to below: exine strati- 

 fication (X 2000); proximal face (x 1000; spore sm-rounded by perine); 



spore in lateral view (x 1000). 



BLECHNUM:— 



h 



Fig. 86. Blechnum polmiforme, part of the sclerine (optical section, x 2000). 

 Attached to the inner surface of the exine is a peculiar (abnormal) process 



leading into the interior of the spore. 



