232 INTRODUCTION TO BOTANY 



portions of this country the farmers collect and carry inland 

 great quantities of brown algse and spread them over the 

 cultivated land as a fertilizer. 1 



FIG. 181. A red alga (Dasya) 



219. The red algae. The red algse grow mostly in deeper 

 water than do the brown algse. They are almost wholly con- 

 fined to salt water. 



The marine forms of this group present most striking shapes 

 and colors. They are of different shades of red, varying from 

 the most brilliant to those that are dark and somber, while 



1 For the reproduction of the brown and red algae, see Bergen and Davis, 

 Principles of Botany. 



