Plate XIV 



Fig. 1. Quercus imhricaria. Transverse section showing small pentagonal 

 pith and ring of sclerenchyma in bark: X 6. 



Fig. 2. Quercus velutina. Transverse section showing very large pentag- 

 onal pith and deeply scalloped ring of sclerenchyma in bark: X 6. 



Fig. 3. Quercus Leana. Transverse section, elongated, narrow pentagonal 

 pith, and deeply scalloped ring of sclerenchyma in bark: X 6. 



Fig. 4. Quercus imhricaria. Transverse section showing distinct annual 

 ring, large uniform vessels in one or two rows in spring wood, few small vessels in 

 radial chains in summer wood, broad medullary ray, uniseriate rays (inconspic- 

 uous), wood parenchyma cells in wavy tangential bands: X 285. 



Fig. 5 Quercus velutina, Transverse section showing annual ring, smaller 

 vessels varying in size in groups in spring wood, few small ones in radial chiuns 

 in summer wood, broad medullary rays, prominent uniseriate rays, wavy tan- 

 gential masses of wood parenchyma in summer wood; X 285. 



Fig. 6. Quercus Leana. Transverse section showing annual ring, vessels 

 showing tendency toward grouping, small ones distributed radially in summer 

 wood, broad medullary rays, uniseriate rays (inconspicuous), wavy tangential 

 masses of wood parenchyma in summer wood; X 285. 



Fig. 7. Quercus imhricaria. Radial section showing vessels with numerous 

 tyloses; X 285. 



Fig. 8. Quercus velutina. Tangential section showing broad and uniseriate 

 medullary rays, vessels without tyloses; X 285. 



J'iG. 9. Quercus Leana. Radial section showing vessel with tyloses; X 285. 



