PLATE XLVI. 



Gsertneria deltoidea Torr. 

 Fig. 15. Showing tracheal tube elements of macerated stem, x 575. 

 Fig. 16. Bast and wood fibers from macerate. x 575. a, Wood 

 fibers; 6, bast fibers. 



Fig. 17. Tracheal elements found in macerated stem, x 575. 



Fig. 18. Longitudinal section. A, bast fibers; B, starch sheath. 

 X 575. 



Fig. 19. Cross section, xylem tissue, showing at a, wood fibers, and at 

 6, tracheal elements, x 575. 



Fig. 20. Xylem parenchyma elements found in macerate, x 575. 



