46 
BULLETIN 1074, V. S. DEPAET:MEXT OF AGRICULTITEE. 
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 
cheeks, while the cheeks of 
shrunken kernels are always 
angular. It is necessary, 
therefore, to examine nor- 
mally developed kernels in 
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 shai-p distinction between the angular and 
the rounded cheeks. 
Fig. 16. — Cheek shapes : a 
lar. (Natural size and 
ters.) 
BRUSH CHARACTERS. 
The brush of the kernel is the hair at the tip or the end opposite 
the germ. Cobb {71) described in detail the brush of 50 varieties of 
wheat orrown in Australia. 
SIZE OF THE BEUSH. 
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 IT, «, h, and c. 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, it 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. Xearly all varieties of 
wheat come within this class. A 
large brush is one which extends 
partly over the sides of the kernel, chiefly along the crease. 
Fig. 17. — Brush sizes : a, Small ; b^ niid- 
sized ; r. large : d. collared brush. (Nat- 
ural size and enlarged 3 diameters.) 
lenCtTH 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 
i 
