PLATE 25 



ISOACHLYA MOMLIFERA 



Fig. I. Stalked oogonia. X 503. 



Fig. 2. Oogonia which were in a chain but. ha\e now fallen apart. X 27! 



Fig. 3. Two oogonia, one inside an empty sporangium. X 3i9- 



Fig. 4. Oogonia in a chain. X 503. 



Fig. 5. Sporangia and gemma. X 278. 



Eig. 6. Oogonia and gemmae. X 278. 



Fig. 7. Oogonia in a chain. X 278. 



Fig. 8. Oogonium of odd shape. X 188. 



Fig. 9. Sporangia and young oogonium. X 278. 



Fig. 10. Sporangium and young oogonium. X 278. 



Fig. II. Oogonium of odd shape. X 188. 



Fig. 12. Oogonia and gemmae in chain, X 278. 



Fig. 13. Oogonium with a long stalk. X 278. 



Fig. 14. Sjjorangium and young oogonia. X 278. 



Fig. 15. A mature egg. X 810. 



