PLATE 1 



(From Mycologia 6: PI. I47- i9'4) 



Pythiopsis cymosa 



Fig. I. Oogonium with a typical sub-basal antheridium. X 720. 

 Fig. 2. Ditto, with an additional lateral antheridium. X 720. 

 Fig. 3. Ditto, with two sub-basal antheridia. X 720. 



Figs. 4, 5, 6 and 7. Oogonia of various forms with antheridia of various origin. X 720. 

 Fig. 8. An abnormal double oogonium, apparently without an antheridium. X 720. 

 Fig. 9. Sporangia of typical shapes. X 447' 



Fig. 10. Sporangia about one minute before discharge showing the spores in the compress- 

 ion stage. X 447. 

 Fig. II. Gemmae; one having discharged spores by a basal papilla. X 447- 

 Fig. 12. Spores, killed while swimming: one with four cilia and double size. X 720. 



