18 



Plate III. 



Fig. 15. A ripe sporangium. X 350. 



Fig. 16. Apex of ripe sporangium, showing apical cavity 



and lamellated inner wall. X 800. 

 Fig. 16a. Zoospores after escape from sporangium. The 



spot in the hyaline apex probably represents 



the nucleus. X 550. 

 Figs. 17 and 18. PaHsade cells with lateral sporangia. 



X 350. 

 Fig. 19. Vegetative budding of one palisade cell from 



another. X 350. 

 Fig. 20. Base of a ripe sporangium, showing the plug, 



the basal cavity, and the mode of separation of 



the sporangium. X 350. 

 Fig. 21. Longitudinal section of the thallus, showing the 



relation of the medullary hyphse to the palisade 



cells. X 60. 



