CHAPTER II 

 GROWING POINTS AND CELL-DIVISION 



IN some of the simpler forms of plants (e.g. Spirogyra) almost 

 every cell may exhibit growth and division, but, in the vast 

 majority, the cells originate in the first instance by division from 



a 



FIG. 5. End of a branch of Sphacelaria. The successive segments cut 

 off from the apical cell (a) are lettered in order from the youngest to 

 the oldest (b e), and show increasing subdivision. 



so-called growing points. These, in the case of a Flowering 

 Plant, are situated at the tips of the stem and root and of their 



