MARINE ALGAL VEGETATION 



111 



the species being rather frequently found intermingled; the Asco- 

 jD/7z///zz/7?-association, in particular, does not appear to be as spot- 



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bound as the others. It generally occurs somewhat below the middle 

 of the area occupied by the community, but may occur also higher 

 up, even at the very top. It is, however, a fairly constant fact that 



