HYDROPHYTE SOCIETIES. 



177 



as a stone. Probably the most prominent group of plants 

 affecting these conditions are algse, both fresh water and 

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



Fig .157. A group of marine seaweeds {Laminarias). Note the various liabits of tlie 

 plant body and the root-like holdfasts. — After Kerner. 



found anchored to some support. The largest display of 

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

 which abound along all seacoasts (see Fig. 15T). It will 



