ADI A N TUM FED A 7 Y J/. I I 7 



3. Yellowish sclercncJiyma, similar to that of the rhizome. 

 Notice the starch, increasing in quantity toward the 

 center. 



4. Draw a portion of the above tissues. 



5. Note the abruptness with which the sclerenchyma joins 



6. The fibro-vascular bundle. Notice the sheath which 

 encircles it. 10 



a. Just within the bundle-sheath, a row of parenchy- 

 ma cells with granular contents (protoplasm) ei.cir- 

 cling the bundle, the pericambium. 



b. The xylem region consisting of 



i. Scalariform vessels ; four (sometimes three or 

 five) of which, occupying the center of the 

 bundle, are in pairs, one pair larger than the 

 other ; the remainder, much smaller, are in 

 t\vo clusters, one between the vessels of the 

 smaller pair and the pericambium on each 

 side. If the scalariform vessels are not easily 

 made out, a section may be treated with pot- 

 ash or stained with iodine. They then become 

 very plain. 



ii. Xylem parenchyma; packed between and imme- 

 diately around the larger vessels. 



c. The phloem region ; its two parts separated by 

 the xylem, lie outside of the vessels of the larger 

 pair and consist of parenchyma with granular con- 

 tents and empty sieve vessels. 



7. Considering the whole bundle, notice that all the tis- 

 sues it contains are symmetrically disposed about a cen- 

 ter. It is therefore known as a radial bundle. 



10 The bundle sheath frequently breaks in cutting. 



