1238 Wisconsin Academy of Sciences, Arts, and Letters. 
EXPLANATION OF PLATE XCI. 
Figs. 38-39. Cell and nuclear fusions in the promycelial cells. Doas- 
sansia deformans. 
Fig. 40. Young'spore-ball. 
Fig. 41. Older spore-ball with sterile paerenchyma forming in center. 
Fig. 42. Section of edge of spore-ball, (a) layer of hyphae around it. 
(b) fertile spores, (c) sterile cells. 
Fig. 43. (a) and (b) Binucleated cells from the mycelium between 
the spore-balls. 
Fig. 44. Haustoria in a host cell. X500. 
Fig. 45. Detailed view of a haustorium. 
