Jross section of l arge leaf trace as it appears in its longitudinal course through a node near the 
apex of the stem. There is a great deal of protoxylem and a few scattered scalariform elements 
at the flanges of the bundle. The bundle is surrounded by parenchyma cells which have a 
dark granular deposit of tannin and other substances. X 198 
A. —Phloem 
B. —Scalariform xylem elements 
C. —Protoxylem 
