148 



Elementary Biology, 



Parenchyma. The parenchyma of the xylem and 

 phloem is mainly important as presenting us with the re- 



FIG. 66. TRANSVERSE SECTION OF FIBRO-VASCULAR STRAND OF Zeamait. 

 (x 5 oo). (Sachs.) 



\ 



\ 



/, fundamental parenchyma of a, outer and /, inner part of the stem, en- 

 closing prosenchyma ; g; g, pitted ducts ; ,y, spiral vessel ; r, annular 

 vessel ; /, air cavity ; v, v t phloem. 



mains of the primitive cambium or growing tissue from 

 which the entire strand was originally formed. 



