PLATE 50 

 AcHLYA sp.? Form without oogonia. 



Figs. I, 2, 3. Various forms of gemmae. Figs. I, 3 X 108; 2 X 167. 



Fig. 4. A chain of gemmae, the contents of which have formed spores. X 167. 



AcHLYA APICULATA var. PROLIFICA 



Fig. 5. Sprouting egg. X 100. 



ISOACHLYA MONILIFERA 



Fig. 6. sporangia showing internal proliferation. X 167. 



Fig. 7. Internal proliferation as in Saprokgnia and cymose proliferation as Achyia. in 



X 167 



Fig. 8. A chain of oogonia in a sporangium. X 167. 



Fig. 9. Irregular oogonia in a chain. X 167. 



Fig. 10. Moniliform sporangium. X 167. 



Fig. II. Sporangium renewed by cymose branching. X 167. 



Fig. 12. Spore stained to show cilia. X 720. 



Aphanomyces scaber 



Fig. 13, 14 Sporangia and encysted spores. X 720. 

 Fig. 15, 16. Oogonia with ripe eggs. X 720. 



Aphanomyces laevis. 

 Fig. 17. The fungus shown growing parasitically on a chain of desmids. X 447. 



