HYDROPHYTE SOCIETIES. 



177 



as a stone. Probably the most prominent group of plants 

 affecting these conditions are algae, both fresh water and 

 marine. In the fresh waters very many of the algae will be 





FIG. 157. A group of marine seaweeds (Laminarias). Note the various habits of the 

 plant body and the root-like holdfasts. After KEENER. 



found anchored to some support. The largest display of 

 such forms, however, is found among the marine algae, 

 which abound along all seacoasts (see Fig. 157). It will 



