144 WOOD AND FOREST. 



44 

 BUR OAK. Mossy-Cup OAK. OVER-CUP OAK. 



Quercus macrocarpa Michaux. 

 Quercus, the classical Latin name; macrocarpa, refers to the large acorn. 



Habitat. 



Leaf. 



Habitat: (See map) ; 

 best in southern Indiana, 

 Illinois and Kansas. 



Characteristics of the 

 Tree: Height, 70'-130', 

 even 170'; diameter, 5'-7'; 

 branches, high ; corky 

 wings on young branches; 

 bark, gray brown, deeply 

 furrowed ; deep opposite 

 sinuses on large leaves; 

 acorns, half enclosed in 

 mossy-fringed cup. 



Appearance of Wood: 



Color, rich brown, sap- 

 wood, thin, lighter; ring- 

 porous; rings, marked by 

 1 to 3 rows of small open 

 ducts ; grain, crooked ; 

 rays, broad, and conspic- 

 uous. 



Physical Qualities : 

 Heavy (9th in this list), 

 46 Ibs. per cu. ft.; sp. gr., 

 0.7453; very strong (16th 



