346 THAXTER. 



PLATE II. 



Endogone fasciculata Thaxter. 



Figure 21. Sorus of chlamydospores viewed externally. Zeiss obj. A, 

 oc. 4. 



Figure 22. Section of sorus of chlamydospores showing, above, a few 

 adjacent young zygospores. Zeiss, obj. A, oc. 4. 



Figures 23-26. Different stages in the formation of zygospores. Zeiss 

 obj. J, oc. 2. 



Figures 27-28. Separated chlamydospores. 



Endogone vesiculifera Thaxter. 



Figure 29. Partial section of a sorus showing origins and association of 

 chlamydospores and thin-walled clavate vesicles. Zeiss obj. A, oc. 4. 

 Figure 30. Clavate vesicles and their origin. 

 Figures 31-32. Separated chlamydospores and their origins. 



Endogone fuegiana Spegazzini. 



Figure 33. Section of gleba showing discrete spore-groups. Zeiss obj. A, 

 oc. 4. 



Figure 34. Section of single spore-group, showing spore-origins. 



Endogone microcarpa Tulasne. 

 Figures 35-37. Chlamydospores from Californian material. 



Endogone arenacea Thaxter. 

 Figures 38-40. Three mature chlamydospores with their origins. 



Endogone pulvinata Hennings. 

 Figures 41-43. Three chlamydospores from the type material. 



Endogone borealis Thaxter. 

 Figures 44—45. Two chlamydospores. 



