Fig. 114. Monocotyledonous stem structure. Transverse section of convallaria 

 rhizome: E, epidermis; H, hypodermis composed of collenchyma; C, cortex; EN, endo- 

 dermis; S, perihadromatic sieve; T, trachea or vessels; P, Pc^renchyma. The bundles are 

 of the collateral and concentric types. 



