218 ip o t e I s i a 



several yards in length are produced 

 in two tufts. 



Dictyoneuron. A peculiarity of this 

 genus is the gradual dying away of 

 the stipe, which, however, forks repeat- 

 edly, separating the laminae, which are 

 reticulated somewhat as in Costaria, 

 but much slenderer. 



Macrocystis. From the strong hold- 

 fast arises commonly a stipe which forks 

 once or more in the ordinary manner, 

 but all subsequent splittings of the 

 lamina are one-sided, giving rise to 

 extremely long (up to a thousand feet), 

 rope-like branches, at regular intervals, 

 upon which are borne the wrinkled 

 laminae, each provided with a pneu- 

 matocyst at its base. 



Egregia, This plant, which is the 

 highest of the kelps, produces, from its 

 strong holdfast, short, forked stipes, 

 which are prolonged into slender, strap- 



