LIFE HISTORIES OF ALG^ 255 



that is, for the maintenance of the individual; at another 

 time the entire plant body functions reproductively, 

 that is, for the maintenance of the race to which the 

 individual belongs. 



246. Life History of Pleurococcus. — The simple life- 

 history of Pleurococcus may be briefly indicated as follows : 



OUTLINE OF LIFE HISTORY OF PLEUROCOCCUS 



Unicellular plant 



4- 



Cell-divisions 



i 



Temporary cell-aggregates 



I 



Separation of daughter-cells 



Ar Ar Ar •\' 



Unicellu- Unicellu- Unicellu- Unicellu- 

 lar plant lar plant lar plant lar plant 



