B> o 5 t e i t a 217 



Lessonia. The stipe is very strong 

 and massive and is repeatedly forked 

 into branches and branchlets. Each 

 ultimate branchlet carries a slender, 

 elongated lamina, some of which are 

 provided with midribs, others without. 



Postelsia. From a strong holdfast 

 rises a tubular stipe a foot or so in 

 height, upon the end of which is 

 borne two close tufts of slender 

 wrinkled laminae up to three or four 

 inches in length, or even more. The 

 plant is characteristically a surf 

 plant. 



Nereocystis. The general habit is 

 something like that of Eisenia and Pos- 

 telsia, but the stipes grow to a great 

 length in the deeper waters offshore, 

 becoming swollen at the summit into 

 bladders, or pneumatocysts, sometimes 

 six inches in diameter. Upon the top 

 of the bladder, ribbon-like leaves often 



