152 MORPHOLOGY. 



held firmly together by a gelatinous substance. The masses in this species 

 are about the size of a small pea, or smaller. Growth takes place in chae- 

 tophora at the ends of the threads and branches. That is, growth is api- 

 cal. This, together with the branched threads and the tendency to form 

 cell masses, is a great advance of the vegetative condition of the plant upon 

 that which we find in the simple threads of oedogonium. 



I 



