PLATE CV. 



FIGS. 1'AGE 



1-2. XantJtitliinti- nuatum var. fiwnm Nordstedt. x 



500 . . . 54 



3-4. -X. an/nthiiii var. irreyidariuy West, o, x 500; 



4, x 400 .... 55 



5. A carious form of X. arniatuiu, which may be a 

 reduction form, or one of the earliest stages in 

 the development from the zygospore, x 400 . 54 



