46 BULLETIN 1074, U. S. DEPARTMENT OF AGRICULTURE. 
CHEEK CHARACTERS. 
The cheeks of a kernel are the ridges along each side of the crease - 
on the ventral surface of the kernel. The most distinguishing 
character of the cheek is the outline of the crest in cross section. 
This is described as rounded or angular. These shapes and some of 
the variations that exist in each are shown in Figure 16. Extremely 
starchy (yellow-berry) ker- 
nels always have rounded 
as ae, cheeks, while the cheeks of 
1 shrunken kernels are always 
me } angular. It is necessary, 
Fie, 16.—Cheek shapes: a@, Rounded; 0, angu- therefore, to examine nor- 
lar. (Natural size and enlarged 3 diame- mally developed kernels in 
ey order to recognize the differ- 
ences. All of the durum wheats have angular cheeks. Most of the 
common wheats have cheeks which are more or less angular, but a 
few varieties, such as China and Turkey, consistently have rounded 
cheeks. There is no sharp distinction between the angular and 
the rounded cheeks. 
BRUSH CHARACTERS. 
The brush of the kernel is the hair at the tip or the end opposite 
the germ. Cobb (77) described in detail the brush of 50 varieties of 
wheat grown in Australia. 
SIZE OF THE BRUSH. 
The size of brush refers to the area which it occupies on the 
kernel. The area of the brush is described as small, midsized, and 
large. These differences are shown 
in Figure 17,a,6,and ¢. A small 
brush is one which occupies only 
a portion of the tip of the kernel. 
In kernels which are distinctly 
pointed at the tip, however, 1t may 
cover all of the end, but because 
of the small area occupied it is 
still referred to as small. A mid- 
sized brush covers the tip of the 
kernel. Nearly all varieties Of pie) 172 Brush bined a, Small; b, mid- 
wheat come within this class. A sized ; ¢, large; d, collared brush. (Nat- 
large brush is one which extends ural size and enlarged 3 diameters.) 
partly over the sides of the kernel, chiefly along the crease. 
LENGTH OF THE BRUSH. 
The length of brush refers to the average length of hairs, which 
are described as short, midlong, and long. These lengths are shown 
