EXPLANATION OF THE ILLUSTRATION 
Prater V 
A. Teosinte (Xochimilco) 
3. Maize (Puno) 
— 
C. Teosinte (Jutiapa ) 
D. Maize (Huesillo) 
kx planation 
A. Another Mexican teosinte, showing considerable maize influence, 
according to genetic studies. The exine pattern is rather regular, the 
phase retardation rather strong. 
B. Probably the most nearly pure maize. The spinule distribution is 
very regular (most clearly shown in the large photograph), and the 
phase retardation of the spinules pronounced (seen best in the small 
illustration ). 
C. Primitive teosinte, showing the same characteristics as Kl Valle 
teosinte shown in Plate IV (D). 
D. A tripsacoid maize showing a pattern similar to maize-like teo- 
sintes (as teosinte Chalco, Plate IV, C). The spinules are pale and 
frequently clumped. 
