PLATE XXII. 



Pignrw magnified iOO diam^tpr- 



Pat.f. 



XantHIDTXTM A ntii nr \ fim. \*:ir. trii|iiet rum. front vipw. 04 



' triangular <n<l view. . . 04 



zygospore with the empty Bemi- 

 cells attached, . . 94 

 4. Xanthumutm i la r< I i \ti\m. . . 93 

 ' 5, in process "t dividing, . 93 

 Figs. B. 7. " " " semicell in two views, develop- 

 ing a sort of spore without con- 

 jugation; :ni ahnonnal process, 93 

 S, 9. X an i iiimi m rETBACENTBOTUM, front and end view, . 95 

 Hi. 11. X \NTiiii>n:.M RECTOCORNirn m, fronl and end view, . . 04 



