460 



General Botany 



Antheridium 



Fig. 280. Rockweed {Fucus evanescens) : A, sketch of plant showing dichoto- 

 mous branching, air bladders, and fruiting bodies ; B, growing point ; C, cross- 

 section of thallus ; D, enlarged view of a part of the cross-section, showing tissues ; 

 E, section of a conceptacle from a fruiting body, in which antheridia and oogonia 

 are forming; F, oogonium with eight eggs; G, branch with three antheridia; 

 H, egg with attached sperms, only one of which unites with the egg. 



