G 



FlG. 8. V. Roussehtii. Development of the oospore. 



A, Female initial cell enlarging, still ciliate ; B, enlargement continuing, cilia lost; 

 C, nearly mature oosphere in side view ; in B and C spermatozoids are shown 

 in the hollow of the parent colony outside the oogonium vesicle ; D, oospore 

 sunk within peripheral layer ; E, F, 2- and 4-celled oospheres ; in F the 

 surrounding parent cells are shaded ; G, H, formation of the spiny exospore ; 

 in H the fixation has caused the dark green protoplast to shrink away from 

 the outer wall which it is secreting and which is still thin and delicate. 



All x about 1000. 



