PLATE LIII. 



Gsertneria deltoidea Torr. 



Fig. 47. Cross section, root, showing, a, root hairs; 6, cortex tissue; 

 c, pericycle; d, stone cells; e, phloem; /, xylem. x 170. 



Fig. 48. Showing cross section of xylem of root, x 700. 



Fig. 49. Longitudinal section, root, a, wood parenchyma; 6, tracheal 

 tubes. 



Fig. 50. Longitudinal section of root xylem, showing, o, wood fibers; 

 b, tracheids; c, tracheal tubes. X 525. 



Fig. 51. Longitudinal section of root xylem, showing ring-formed 

 remnants of end walls of tracheal elements, x 350. 



Fig. 52. Cross section of stone cells of root, x 700. 



