PLATE 3 
A. —Portion of a main stalk of Funk Ninety-Day com (Zea mays indentata) showing 
one type of barrenness. The cob is of normal length but the grain production is 
practically nothing. The leaves were purpled and many of the vascular bundles in 
the stalk were almost black. Bloomington, Ill., 1920. 
B. —Portion of a main stalk of com (Zea mays indentata) showing an extreme case of 
the most common type of barrenness found in connection with the black-bundle 
disease of com. The ear is almost entirely aborted. In other typical cases small 
nubbins of various lengths are produced which usually curve toward the stalk. Bloom¬ 
ington, Ill., 1920. 
C. —Portion of a main stalk of com (Zea mays indentata) showing an attempt at 
multiple ear production. A high percentage of such plants have blackened vascular 
bundles in the stalks. Bloomington, Ill., 1920. 
