10 BULLETIN 815, U. S. DEPARTMENT OF AGRICULTURE. 
pointed. They are responsible for many injuries to the fruit, par- 
ticularly during periods of strong winds. 
The typical fruits, as shown in Plate IV, are oblong in shape and 
likely to be ridged or malformed. The rinds are usually very thick, 
and coarse and rough in texture; the rag is abundant and tough; 
the juice is scant and lacks acidity and flavor. The fruits, which 
have an average of about four seeds, grow very rapidly, and when 
picked with the normal interval between pickings are much larger 
than those of other strains. 
The comparatively heavy production of the trees of the Bull 
strain has made some growers hesitate to eliminate them. The 
fruits are poor, and when included in the regular pack frequently de- 
preciate the value of the crops in which they occur. From the ob- 
servations on the value of trees of the Bull strain and their fruits, 
it can be safely recommended that all such trees be top-worked or 
replaced with trees of the desirable strains. 
VARIEGATED STRAIN. 
Other strains of the Lisbon variety than those described in this 
bulletin have been observed but have not been studied fully as yet. 
Among these additional variations the Variegated strain is partic- 
ularly interesting, occurring rather frequently im some Lisbon or- 
chards. A typical example of a fruit of the Variegated strain is 
shown in Plate V.. The trees and fruits are similar in appearance 
and have very much the same characteristics as those of the Varie- 
gated strain of the Kureka variety. 
SPORTING STRAIN. 
The trees of the Sporting strain of the Lisbon variety resemble in 
their condition of variability the Sporting trees of the Eureka variety. 
They contain branches bearing fruits typical of all the strains so far 
observed in the Lisbon variety, together with other variations not 
classified as strains in these studies. One of the most common of 
these minor variations found in the trees of the Sporting strain is a 
bell-shaped fruit, usually deeply ribbed or fluted in appearance. This 
variation is shown in Plate VI, figure 7. This and the other forms | 
shown in the same illustration were found on a lemon tree grown from 
a single bud. Other variations of frequent occurrence are uniformly 
ridged fruits. This condition gives the fruits the appearance of fine 
corrugations, as shown in Plate VII. Entire trees bearing both the 
bell-shaped ribbed fruits and the corrugated-appearing fruits have 
been observed in the orchards in which the performance records have 
been obtained. In the trees in the performance-record plats, how- 
ever, only single fruit or branch variations having these character- 
istics have been found. 
