1915 



Muenscher; on Algal Associations 



83 



one of the most dominant species in each association. Zostera forms an 

 association in the shoal water of bays. 



1. Endocladia association. 



2. Fucus association. 



3. Ulva association. 



4. Laminariaceae association. 



5. Zostera association. 



4. The number of species common to each association increases in 

 the lower associations. 



5. The algae in general are larger in the lower than in the higher 

 associations. 



6. The different groups of algae are not restricted to any definite 

 associations. 



a. Rhodophyceae, Phaeophyceae and Chlorophyceae are found in 

 each of the four associations, therefore it is evident that Agardh's (1) 

 three zones of algae, viz., red, brown and green, do not hold. 



b. Rhodophyceae are found almost equally distributed in the dif- 

 ferent associations. 



c. Phaeophyceae are most abundant in species in the Laminariaceae 

 association. 



d. Chlorophyceae are most abundant in the Ulva association. 



e. Myxophyceae are represented only by a small number of marine 

 species. 



Table 8. Showing number of species in each association 



I wish to express my sincere appreciation for the generous assistance 

 of Professor Josephine E. Tilden, of the University of Minnesota, under 

 whose direction this work was conducted at the Puget Sound Marine 

 Station during the summer of 1915. 



