PLATE LV. WHITE OAK. 



1. Flowering branch with immature leaves (s) 



staminate blossoms, (p) pistillate blossoms, 



2. A staminate flower, enlarged. 



3. A pistillate flower, enlarged. 



4. Branch with mature leaves and mature 



acorns, x J. 



5. Acorn cup, x J. 



6. Acorn, basal view, x J. 



7. Longitudinal section of acorn showing em- 



bryo, x J. 



8. Germinating acorn with its young root and 



shoot, x i. 



9. Winter branch, x J. 



10. Terminal section of winter branch showing 



bud with overlapping scales, a leaf-scar 

 with bundle-scars, and lenticels, enlarged. 



11. Cross section of twig showing pentangular 



pith, wood with conspicuous medullary 

 rays, inner and outer bark, enlarged. 



