Plate VIII 



PLATE VIII 



Figure 44.— Longitudinal section of joung root still enclosed in tlie 

 stem; sliowing its origin in the stem, the meristematic epider- 

 mis and subepidermis in the stem above root apex and the 

 four meristematic laj'ers in the root. X 210. 



Figure 45.— Portion of rootstock and root; the latter showing cole- 

 orrhiza. X 6. 



Figure 46.— Cross section of vascular bundle of root with endoder- 

 mis ; showing tracheae and sieve tubes. X 400. 



Figure 47.— Longitudinal section of vascular bundle of root, also 

 with endodermis and, to the left, three layers of cortical par- 

 enchyma; showing tracheae, sieve tube, companion cell and 

 undulations in walls of cortical parenchyma. X 400. 



