VASCULAR BUNDLES OF THE AXIS. 



127 



connected with this so-called cauline strand. Usually, however, a larger number of 

 six, eight, ten, or even of hundreds of single thin vascular bundles run in a shoot-i 

 axis ; and each single vascular bundle generally belongs in its lower course to the 

 shoot-axis, but curves outwards into a leaf with its upper limb, in such a manner 



Fig. isg.~Cletnatis viticella (after Nageli). Apex of 

 a shoot rendered transparent in order to show the course 

 of the vascular bundles, the upper ends of which curve out- 

 wards into the leaves. The youngest leaves {a-^) possess 

 as yet no" vascular bundles. 



Fig. 130.— Diagram showing the course of the vasculal^ 

 bundles in a Monocotyledon of the Palm type (after Fat* 

 kenberg). b, 6 bases of the leaves; v growing points of 

 the shoot. 



that each leaf takes up into itself one, two, three, or many such terminations of 

 the vascular bundles of the shoot-axis. In the interior of the latter, however, 

 the single bundles are joined together so that the lower end of each becomes 

 fitted somewhere on the course of an older strand curving into a leaf situated 



