Plate VII. 



FIG. 19. Tranverse section of a closed, collateral vascular bundle from th stem 

 of Indian Corn. Zea Mays. A, thin-walled parenchyma surrounding the bundle; B. 

 large pitted vessels in section; C, sclerenchymatous cells forming a sheath about 

 the bundle; D, phloem of the bundle, with sieve-tubes and bast-fibres; E, spiral or 

 annular vessel in section; F, intercellular space of lysigenous origin. <x200). 



