1236 Wisconsin Academy of Sciences, Arts, and Letters .. 
EXPLANATION OF PLATE XC. 
Urocystis Anemones. 
Fig. 21. Binucleated cells from the mycelium. 
Figs. 22-23. Beginning of spore-ball formation; young branches. 
Fig. 24. (a) Surface view of young spore-ball; dotted lines indicate 
contours of hyphal tips behind the part in view, (b) same 
showing nuclei. 
Figs. 25-26. Young spore-balls. 
Fig. 27. Nearly mature spore-ball showing all cells with two nuclei. 
Figs. 28-29. Haustoria. 
Ustilago Hordei. 
Figs. 30-34. Fusions in promycelial cells with nuclei in various stages 
of migration or fusion. 
Fig. 35. Three promycelial cells fused and nuclei in middle one. 
TJstilago Avenae. 
Figs. 36-37. Nuclei and most of the cytoplasm in the large conjuga¬ 
tion tube. 
