The Stigma of a Poppy, Greatly Enlarged 



The stigma of the flower may be variously modified to facilitate 

 reception of the pollen. This picture shows the curious arrange- 

 ment in the case of a poppy. The pollen grains deposited on this 

 stigmatic surface send out little tubes that penetrate the stigma 

 and ultimately make their way to the ovule or seed case, 

 carrying the nucleus that unites with the nuclues 

 of the egg cell, thus effecting fertilization. 

 Each egg cell is fertilized by a 

 single pollen nucleus. 



