Plate VI. 



FIG. 18. Transaction of an open, collateral flbro-vascular bundle from the stem 

 of BapMria nititla. A, thin-walled cortical parenchyma surroundinj: the bundle; H, 

 large thick-walled vessels of the xylem; (-. thin-walled cells of the cambium; I), 

 sieve duct of the phloem; E, wood pareuchyma of the xylem. (.\350.) 



