cri/shed 

 bast 



134. Cross-section of a bundle of Corn: (d) duct, (a) annular tracheid (i. e.. with ring- 

 shaped thickenings), {sp) spiral tracheid (i. e. with spiral thickenings), {wp) wood 

 parenchyma, {si) sieve-tube, {cc) companion cell, {sir) strengthening fibers. 



