THE ALGAE 



121 



from eight to thirtv-two nuclei are formed. Cleavage furrows now appear 

 in the cytoplasm, which divide the contents into zoospores. A pore develops 



Fig io3.-Aglaozoma reptam. A to E, Early stages in development of the 

 C°L-/a zygote, pf G and H, Older stages in development of the 

 Aglaozonia thallus. {After Yamanonchi.) 



at the top of the zoosporangium and through this the zoospores escape 

 (Fig. 105). 



The Germination of the Zoospores 



When liberated the zoospore is an oval body containing about twenty 



plastids, associated with which is a single red pigment spot. It possesses 



two lateral flagella of unequal length, one being about twice the length ot the 



other. The longer one is directed forwards, while the shorter trails behind. 



5A 



