MORPHOLOGY OF HIGHER PLANTS. 



189 



food materials. The more or less crude inorganic materials are 

 carried from the root through the woody portion of the stem to 

 the leaves, and from the leaves the products of CO, assimilation, 

 as well as other plastic substances, are distributed through some 



Fig. 104. Longitudinal-transverse section of licorice rhizome including the cambium: 

 P, parenchyma; T. tracheag or ducts; WP, wood fibers; C, cambium; S, sieve; CF, crystal 

 fibers; BF, bast fibers; MR, medullary ray. 



of the tissues of the bark to other parts of the plant. The tissues 

 or elements of the wood which conduct food materials arc of sev- 

 eral forms and include tracheae or ducts, tracheids and conducting 

 parenchyma ; and the elements of the bark which transport the 



