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 arrangement 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 nucleus of the egg cell, thus effecting fertilization. Each egg cell is fertilized by a single pollen nucleus.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 3 Chapter 3