HOW TO KNOW THE SEAWEEDS 

 162b Apex of stipe not forked. Fig. 206 Postelsia palmaeioTinis 



it-." 



Figure 206 



Fig. 206. Postelsia palmaeformis Ruprecht 



Habit of a group of plants from a "grove," X 0.25. This plant 

 may commonly be observed on the Pacific Coast from central CaU- 

 fomia to Vancouver Island, B. C, but its habitat is such as to make 

 collection of specimens difficult. The "groves" occur on rocks at low 

 intertidal levels in places which are subjected to the full force of the 

 heaviest surf. Many of them are completely inaccessible on outlying 

 rocky ledges, but others may be reached at times of lowest tides in 

 calm weather. The heavy, elastic stipes are exceedingly well adapted 

 to the pounding surf conditions of Postelsia's habitat. 



156 



