PLATE 2 
The small letters have the following significance: p, pith; x, xylem or wood ring; 
y, second wood ring; m, cambium; s, sieve tubes; b, hard bast or stereome; k, cork 
cambium or phellogen; c, cortex; e, epidermis. 
A. —Cross section of root of blackberry. 
B. —Cross section of 2-year-old blackberry cane. Note only one wood ring. 
C. —Section of infected cane of blackberiy, No. 135, at c in Plate 6, A, just below 
the proliferating branch, b. Note a partial second wood ring, y. Mycelium was 
found only in the pith. 
D. —Section below a primarily infected branch of blackberry cane. No. 24. The 
mycelium grew down into the stem along the cambium which was stimulated to form 
a new ring of abnormal wood and additional phloem. In this section hyphae were 
ound all through the wood in the second ring, y, and in the rays and phloem. 
