PLATE 24 



ISOACHLYA ECCENTRICA 



Fig. I. Cylindrical oogonium wilh four eggs inside an empty sporangium. X 447. 



Fig. 2. An empty dictiosporangium. X 167. 



Fig. 3. Irregular oogonia. X 247. 



Fig. 4. A thread showing empty sporangia, sprouting spores and one empty cyst near 



top, 00 onia on lateral stalks and intercalary oogonia. X 247. 

 Fig. 5. Part of a thread showing a single oogonium and a chain of three. X 247. 

 Fig. 6. A thread showing oogonia before and after eggs are formed and a gemma at 



the end. X 167. 

 Fig. 7. A cluster of empty sporangia, X 167. 

 Fig. 8. A compound sporangium. X 167. 

 Fig. 9. A group of empty sporangia. X 167. 

 Fig. 10. A gemma after emptying as a sporangium. X 247. 

 Fig. II. Three empty sporangia. X 247. 

 Fig. 12. An empty sporangium proliferating internally by two threads which bear young 



oogonia. X 247. 

 Fig. 13. Two . mpty sporangia from transformed gemmae. X 247. 

 Fig. 14. An immature oogonium and a forked gemma. X 247. 

 Fig. 15. Two t pores showing cilia in first swimming stage. X 720. 

 Fig. 16. An oogonium showing one pit and a mature eccentric egg. X 720. 



