THE WHITE LILY 



161 



in the absence of blindly ending branches, and in the 

 strongly marked parallel course of the stouter bundles. 

 In the broad ground - leaves, however, the parallel 

 veins are less conspicuous, and the network more 

 resembles that of a Dicotyledon. 



In these leaves, as in those of most plants, the rule 



FIG. 62. Part of section parallel to surface of leaf of Lily. 

 v.b, vascular bundles ; p.p, parenchyma of mesophylL 

 Magnified about 35. (R.S.) 



holds good that the wood of the bundle is directed to- 

 wards the upper and the bast towards the lower surface. 

 The minute structure of the bundle in the leaf is 

 like that in the stem. The finer bundles, however, 

 are much reduced, and here we usually find tracheides 

 II 



