62 



STUDIES OF TUKES 



this species, the seed halls avc u.sually suhtiiry, while in the 

 Oriental sycamore, a European tree similar to the native 



one, they appear in clusters 

 of tAvo, or occasionally of 

 three or four. See Fig. 49. 



Leaf: The stem of the 

 l(\af completely covers the 

 bud. This is a characteris- 

 tic peculiar to sycamores. 



Form and size: A large 

 tree with massive trunk and 

 branches and a broad head. 



Range : Eastern and 

 southern United States. 



Soil and location: Pre- 

 fers a deep rich soil, but will 

 adapt itself even to the poor 

 soil of the city street. 



Enemies: The sycamore 

 is frequently attacked by a 

 fungus {Glocosporium nervise- 

 quum), which curls up the 

 young leaves and kills the 

 tips of the branches. Late 

 frosts also often injure its 

 young twigs. The Oriental 

 sycamore, which is the Euro- 

 pean species, is more hardy 

 in these respects than the 

 native one and is therefore 

 often chosen as a substitute. 



Value for planting: The Occidental sycamore is now 



Fig. 50. — Gray or White Birch 

 Trees. 



