PLATE XLVI 

 Rheosporangium aphanidermatus: 



Fig. I. — Section of presporangium showing nuclei and mitxjchondria. Xz.ooo. 



Fig. 2. — Section of zoospore showing mitochondria. X 2,000. 



Fig. 3. — Advanced stage of zoospore germination. X2,ooo. 



Fig. 4. — Section of zoospore showing position of central vacuole and nucleus. 

 X2,ooo. See also figure 11. 



Fig. 5. — Stages in the preparation of the fused nucleus of the oospore for division. 

 X2,ooo. 



Fig. 6. — Zoospore showing position of sinus in side. X2,ooo. 



Fig. 7. — Section through zoospore showing blepharoplast and sinus. X2,ooo. 



Fig. 8. — Mycelium showing nucleus and mitochondria. Xa.ooo. 



Figs. 9, 10. — Sections of zoospores showing blepharoplast and attachment of cilia. 

 X2,ooo. 



Fig. II. — Zoospore showing orientation of the various structures. X2,ooo. 



Fig. 12. — Maturing oospore showing fused nucleus, large central food body, and the 

 wall, which is tmusually deeply contoured. X2,ooo. 



Figs. 13, 14, 15, 16, 17. — Stages in zoospore germination. X2,ooo. See also figure 3 . 



Fig. 18. — Section of' maturing oospore. First division of fused nucleus completed. 

 X2,ooo. 



Figs. 19, 20. — Maturing oospores showing usual type of wall and the fused nucleus 

 in preparation for division. X2,ooo. See also figures 5 and 12. 



