MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 163 



Fig. 123. J^uercus sp. Partial transverse section of terminal portion of etiolated 

 stem. B, bast fibers. E, cambium. E, xylem. H, perimeduUarj layer. 





Fig. 124. ^uercus sp. Partial transverse section of lower part of stem. I, nor- 

 mal. II, etiolated. E, epidermis. Z>, phellogen. C, collenchjma. B, cortex. 



