74 



CYCLOSPOREJ;. 



similarly set free, and fertilisation takes place in the water, 

 numerous spermatozoids collecting round the oosphere (Fig. 70 E), 

 which is many times larger, and by their own motion causing it to 

 rotate. After fertilisation, the oospore surrounds itself with a 



D E F 



FIG. 70. Fucus vesiculosus. A Portion of thallus with swimming bladders (a) and 

 conceptacles (b). J5 Section of a female conceptacle ; h the mouth; p the inner cavity; 

 s oogonia. C Antheridiophore; a antheridium; p sterile cells. D Antheridia out of which 

 the spermatozoids are escaping. E Fertilisation. F Germinating oospore. 



cell- wall and germinates immediately, attaching itself (Fig. 70 F) 

 to some object, and by cell-division grows into a new plant. 



