SHADE TREES. 



129 



develops rapidly under good soil 

 a diameter of 12 inches in fifteen 



FIG. 3 Rock maple growing in 

 pasture. 



cent .specimens may occasionally 

 planted on avenues and lawns to 

 habit of its branches, 

 together with its liability 

 to injury, affect its value 

 somewhat for street plant- 

 ing. In most situations 

 its real value consists in its 

 rapid growth and ability 

 to produce quick shade 

 effects. It is attacked by 

 a leaf spot fungus (Rhy- 

 tisma) which, however, 

 does little harm. 



RED MAPLE (Acer rub- 

 rum). The red maple is 

 a tree of rapid growth, 

 well adapted to swamps 

 and fairly moist places. 

 It has been planted quite 

 extensively on streets, 

 often, no doubt, in mis- 

 take for the rock maple. 

 It develops large branches, 

 usually rather low, which 

 should be pruned at the 



conditions, and occasionally will attain 

 or sixteen years. In some situations it 

 grows to be an enormous tree, and quite 

 often attains an age of one hundred and 

 fifty years or more. The rock maple is 

 sometimes affected with a leaf spot, 

 and is more susceptible than any other 

 tree to sun scorch and bronzing of the 

 foliage. It is also quite susceptible to 

 frost cracks. During the past five or six 

 years this tree has suffered much from 

 extreme drought, and as a result many 

 staghead specimens are to be seen. 



WHITE OR SILVER MAPLE (Acer sac- 

 charinum). This species is not equal 

 to the rock maple, either from the point 

 of view of durability or of beauty, and 

 it is too commonly disfigured by ice and 

 winds. It grows very rapidly, and in 

 southern New England, where magnifi- 

 be seen, it attains a great size. It is 

 a very large extent, but the drooping 



FIG. 4. Avenue of elms planted close. 



