[Chap. II THE PARTS OF PLANTS 17 



The pond scums and seaweeds (algae) have none of these organs, and 

 certainly there are no organs closely resembling them among the fungi. 

 It is evident that none of these organs is essential to plant life, but they 

 are generally present in seed-bearing plants. As we shall see later, cer- 

 tain fundamental processes are usually associated with each of them but 

 are not necessarily limited to them. 



