PLATE 4 
A. —Streak of Wisconsin leaf spot organism on potato-dextrose agar after four days* 
growth at 2o° to 22° C. in comparison with control tube. Note color difference of cul¬ 
ture medium, as a result of development of yellow pigment on potato-dextrose agar, 
B. —Photomicrograph of Wisconsin leafspot organism. Carbolfuchsin stain. X3»ooo. 
C. —Line drawing of Wisconsin leafspot organism, showing flagella. 
