PLATE 23 



ISOACHLYA UNISPORA 



Fig. I. Intercalary and apical oogonia. X i88. 



Figs. 2 and 3. Typical clusters of oogonia. X i83. 



Fig. 4. Habit of oogonia. X 188. 



Fig. 5. Habit of oogonia showing some in a chain. X 188. 



Fig. 6. Oogonium with sporangium formed in part of hypha just beneath it. X 281. 



Fig. 7. Irregular shaped oogonium. X 281. 



Fig. 8. Three oogonia in form of a cross. X 281. 



Fig. 9. Oogonia in a chain, the one at base empty. X 281. 



Fig. 10. Oogonium in a chain with gemmae. X 281. 



Fig. II. Oogonium with basal ingrowth. X 281. 



Fig. 12. Two ripe eggs, showing structure. X 503. 



