230 Forestry Quarterly. 



South Fork) but here the species does not appear to form over 

 10% of the merchantable timber. Reproduction is abundant 

 however, and seems to indicate that in these locaHties the species 

 is to become predominant. 



On the Cabinet Forest, White Pine is found in small groups or 

 as isolated specimens, in the small basins at the heads of tributary 

 streams, on gentle northerly slopes. On the Lolo, MAhere topo- 

 graphic conditions perhaps cause greater humidity, the species 

 occurs in heavy stand, in mixture with Engelmann Spruce, Larch, 

 and other species. The type is confined, however, to the western 

 end of the Forest — the upper drainage of the St. Regis River, the 

 head of Trout Creek and the West Fork of Fish Creek, which 

 territory corresponds in general with that of the heaviest snow- 

 fall in the Forest. 



Upon the Missoula Forest, Western White Pine is found only as 

 isolated specimens in the Clearwater Valley, probably the South- 

 eastern limit of the range. 



Manner of Growth. — "In dense forests, in which its most 

 characteristic form is found, this pine has a tall, slender shaft, 

 with a peculiarly short-branches, narrow, symmetrical crown ; the 

 branches are usually slender and drooping and in early life extend 

 over one-half or two-thirds the length of the trunk." In Idaho, 

 the regions of its best development, on its best site, its height 

 ranges from 90 to 170 for 140 year old trees and when fully 

 mature, usually from 150 to 200 feet or over. It then is usually 

 from 2^ to 3^ feet in diameter. A white pine somewhat excep- 

 tionally large was cut in the Priest River Valley in 19 10. This 

 tree was 60 inches in diameter breast-high, was cut into twelve 

 16- foot logs, and scaled 7,000 feet B. M. 



Outside of this region of best development, and also within the 

 region on poor situations, such as south slopes, ridges, and thinner 

 soils, "its height ranges from 90 to 100 feet. In open forests, 

 where the conditions are less favorable to its better development, it 

 is a short-bodied tree, 50 or 60 feet in height, with one or several 

 very long, stout horizontal branches extending from 10 to 15 feet 

 or more beyond the other slender branches. This striking char- 

 acter distinguishes the tree as far as it can be seen. The bark of 

 trees a foot or more in diameter is distinctly broken into peculiar 

 small, square blocks. No other tree associated with it has this 



