Plate XXIV 
Plate XXIV. Figures 1 to 20 show spores from a potato plug culture, 
three weeks old. They are all descendants of a single 3-septate spore. 
X 1000. Figures 20 to 26, 30 to 38 show spores from raw potato cul- 
ture two weeks old. X 1000. Figures 39 to 45 show spores from po- 
tato plug culture grown in diffuse light, three weeks old. X 1000. 
Figures 46 to 49, 53, 55 to 58, and 60 show spores from a potato se- 
lected at random. X 1000. Figures 50, 63 to 64 show spores from beef 
bouillon agar, fragmenting into oidia. One of these cells has germin- 
ated. X 1000. 
