-Gross section through the vascular region of a root. X 210. a, Endodermis; b, proto- 
xylem; c, large pitted vessel; d, inner sderenchyma sheath 
-Enlarged view of part of Figure A, to show especially the protoxylem and phloem and 
their relation to each other. X 610. a, Endodermis; b, pericycle; c, interstitial paren¬ 
chyma; d, phloem; e, protoxylem 
