MORPHOLOGY OF HIGHER PLANTS. 



337 



W 



FIG. 193. Collateral fibrovascular bundle in Menispermum: C, cortex; B, bast 

 fibers; St, stone cells connecting groups of bast fibers; S, sieve; M, cambium; T, tracheae; 

 W, wood fibers; R, medullary rays; P, pith, 



22 



