lyo PHAEOPHYCEAE 



and as a result it has seemed desirable to remove the genus from its 

 former position in the Ectocarpales to the Laminariales. 



*Laminariaceae : Laminaria (a thin plate). Figs. 115-118. 



This genus has a very wide distribution in the waters of the north 

 temperate and Arctic zones, and it is commonly studied because its 



Fig. 115. Laminaria. A, L. Cloustoni. B, L. Rodriguez. C-E, normal regenera- 

 tion ( X ^). C, rupture just commencing. D, E, the new tissues are more 

 heavily shaded. F, wound regeneration ( x ^). (A, B, after Oltmanns; C-F, after 

 Setchell.) 



morphology is characteristic of the group as a whole with the 

 exception of Chorda and Desmarestia. Furthermore, it was the 

 first genus in which the existence of a dwarf gametophyte was 

 established, thus leading to a new orientation of ideas in the 

 classification of the Phaeophyceae. The expanded lamina has no 

 mid-rib and is borne on a stipe that arises from a basal holdfast 



