THE ALGAE 



103 



The zoospores are small pyriform bodies with a small anterior beak and 

 two apical flagella, or in some species four. These flagella are differentiated 

 before the emergence of the spores. There are two granules at the point 



ZOOSPORES 



Fig. 85. — Cladophora crispata. Asexual reproduction. A to C, Formation 

 of zoosporangium and liberation of zoospores. D, Motile zoospore. 

 E to J, Attachment and germination of zoospore. {After Cook.) 



where the flagella are inserted and the chloroplast appears as a ring in the 

 posterior part of the cell and shows a slow streaming movement. Those 

 zoospores nearest the orifice escape first, squeezing their way through the 

 opening with their flagella behind them, and they are followed by a steady 

 stream of others. After about twenty minutes they settle down by their 



