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below the growing point, were studied. One of these sections 
is shown in Fig. 49. The tracheary tissue at the lower side 
represents the joint leaf traces of the third leaf. At the upper 
side, the group of four xylem cells at the top of the drawing, and 
three others at the extreme right belong to the traces of the 
fourth leaf. The two separate xylem cells cannot be accounted 
for, unless they belong to the fifth leaf and form the beginning 
of its leaf trace. Otherwise, we should have here a real 
example of ‘‘stelar” tissue. That there is no stelar tissue the 
diagrams in Figs. 41 and 42 demonstrate clearly. The pith 
was of the same origin as in B. simplex. Fig. 43 shows a 
