HYDROPHYTE SOCIETIES. 



i I 



as a stone. Probably the most prominent group of plants 

 affecting these conditions are alga?, both fresh water and 

 marine. In the fresh waters very many of the alga? will be 



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:* 



sf^ 





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

 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 alga?, 

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



