M. integrifolia 



M. pyrifero 



M. ongustifolJQ 



(N. Hemisphere phase) 



Figure 2. Distribution of Macrocystis in North and South America. A. Aerial observations of the coast. 

 B. Detailed diving surveys; points where areas were examined intertidally or by diving are indicated. 

 (From Neushul, 1971, Ref. 26) Note: M. pyrifera occurs as far north as the coast of Alaska but is not 

 dominant north of about 35°N. 



35 



