MORPHOLOGY OF HIGHER PLANTS. 337 



W 



PIG. 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. 

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