24 BOTANICAL GAZETTE [JULY 
round off, leaving a clear space between them and the wall of the 
mother cell. The nucleus and plastids within a zoospore primor- 
dium take a varied arrangement, but there is a cytoplasmic zone 
entirely devoid of plastids, which becomes the anterior end of the 
zoospore. 
The segmentation of the protoplasm in the zoosporangium 
When the mother cell has reached the 4-nucleate stage, the . 
position of the four nuclei is either near the central axis or near 

Fis. Pad —Port rt a ele | 

g al Pog | 
@, some of the superficial cells have grown into several- 
cells of which have beco 
ting zoosporangia ha: 
of the zoosporangium, 
ature of the zoosporangium: 
celled filaments, the terminal 
me zoosporangia; 5, one of the cells equally ranked with neigh- 
$ grown into a many-celled filament, showing the hair nature 
