80 



AQUATIC PHYCOMYCETES 



I 



B I 



v — ■ 





C 









D 



Fig. 5. Cytology of Polyphagus euglenae Nowakowski 

 A. Zoospore with nucleus and basal oil droplet; both oil droplet and 

 nucleus are surrounded by dark-staining chromidial material. B. Young 

 thallus with single nucleus surrounded by chromidial material; delicate rhi- 

 zoids radiate from periphery of body. C. Single nucleus of large prosporan- 

 gium passing into smaller, developing sporangium; large nucleolus has been 

 much constricted in passing through the opening. D. Two nuclei in process 

 of division in young sporangium; extruded chromatin lies on periphery of 



