340 



A TEXT-BOOK OF BOTANY. 



FIG. 195. Monocotyledonous stem structure. Transverse section of convallaria 

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

 dermis; S, perihadromatic sieve; T, tracheae or vessels; P, parenchyma. The bundles are 

 of the collateral and concentric types. 



