PLATE LIV. 



Gsertneria deltoidea Torr. 

 Fig. 53. Longitudinal section, root hairs and root epidermis, x 62.5. 

 Fig. 54. Cross section, ditto, x 625. 



Fig. 55. Cross section of suberized cortical tissue with still function- 

 ing nuclei, x 700. 



Fig. 56. Wood fibers of root, x 330. 



