IP o s t e I s i a 197 



reaches a length of one hundred feet at 

 the Minnesota Seaside Station. From 

 such large plants as these there is a 

 gradation down to the little glove-finger 

 shaped Adenocystis and the attenuated 

 Chorda, no thicker than a straw. The 

 last-named plant does not show a dis- 

 tinction between stipe and lamina, but 

 the rest have a plant-body, sharply 

 differentiated into three principal areas, 

 the holdfast, the stipe and the lamina, 

 while some of them, such as Lessonia 

 a.n&Egregia, reach a high degree of com- 

 plexity through repeated bifurcations of 

 the lamina, or through the production 

 of innumerable outgrowths. Kelps are 

 best developed in the sublittoral or 

 elittoral zones, along the shore, and 

 their bodies show remarkable structural 

 adaptations to the different situations 

 which they prefer. Generally speaking, 

 kelps do not occupy positions so high 



