v3-i 



Fig. 6. - Anther wall xl090 



'fapetal layyr. Op'>ninr: layer. Te- 

 trads. 



Fig. 7. - Anther xl09n - 



Tapetuin whose miclei have divided. 

 Pollen laothoi'-cells. 



Fig, 8. - Tetrad division xin90 

 Fig. 9. Mature pollen grain xl090 

 Fig. 10. - Reticulation on surface of Poll'-jn r^rain 

 xIjOO. 



Fig. 11. - Pollen gr^in. Equatorial section. xl090 

 Fig. 12. - Pollen grain. Equatorial section xl090 

 Generative nucleus free in cavity. 



Fig. 1'6, - Anther wall sl-;owing regeneration of fi- 



brous layer x440. 



