Fig. 1 1 . Brown algae : embryonic developments in some of the 



larger forms 



A, B, C, Laminaria. A, L. saccharina. Young sporophyte seated on oogonium; a, 

 antheridia (after Kukuck); B, C, L. digitata. Young sporophytes becoming paren- 

 chymatous (after Kylin). D, E, Costaria turneri. Germlings (after Yendo). F-J, 

 Fiicus vesiculosus. F, Young embryo showing the first four walls 1-1-4^; r, rhizoid. 

 G, Older embryo, showing regular segmentation pattern. H, J, Older stages, show- 

 ing the origin of the apical cell of the thallus at the base of the first terminal mucila- 

 ginous hair, hi; h^, second hair; /, initial cell (after Nienburg). K, L, Sargassum 

 linifolium. Segmentation of the zygote; 1, 2, the two primary cells; r, rhizoid 



(after Nienburg). 



