Tsu 



ga 235 



Distribution 



On the west coast of North America it extends southwards from south-eastern 

 Alaska, where it forms the greater part of the great coast forest, which reaches from 

 sea-level up to about 2000 feet, and is associated with Menzies's spruce. 



In British Columbia it is very abundant on the coast, and extends as far inland 

 as the heavy rainfall reaches up the valley of the Frazer, on the Gold and Selkirk 

 ranges, and east of the Columbia valley nearly up to the continental divide/ In 

 Vancouver's Island it forms with the Douglas fir and red cedar a large though not 

 economically important part of the forest. In Washington and Oregon it is also 

 one of the principal elements of the forest, of which, in the Cascade Forest Reserve, 

 it forms about nine per cent of the timber," and extends up to 5000 feet, crossing the 

 watershed of the coast range in lat. 45'. 



In the drier parts of southern Oregon it becomes rare, and though it occurs in 

 the redwood forests of northern California as far south as Cape Mendocino, I did 

 not see it on the Siskyou mountains or on Mount Shasta. In the interior it is found 

 in the wetter parts of northern Montana, Idaho, and in southern British Columbia, 

 where, in company with Douglas spruce, Picea Engelnianni, Abies grandis, and 

 Larix occidentalis, it sometimes forms a considerable part of the forest, and reaches 

 up to 6000 feet in the Cceur d'Alene mountains, though I did not see it in the valley 

 of the Blackfoot river, near Missoula, where the climate is drier. 



It attains its finest development on the coasts of Washington and Oregon, 

 where Sargent says that it attains 200 feet in height, with a stem 20 to 30 feet in girth. 

 Plummer, in his Report on the Mount Rainier Forest Reserve,^ says (p. loi) 

 that it attains an extreme diameter of 6 feet, with a height of 250 feet, of which half 

 to two-thirds is crown. The largest that I actually measured, however, on my visit 

 to Mount Rainier in August 1904, were under 200 feet, with a girth of 12 to 14 feet, 

 and these were growing mixed with Tsuga Pattoniana at an elevation of 4000 to 

 5000 feet. 



In the Cascade Reserve Forest of northern Oregon, near Bridal Veil, at about 

 3500 feet elevation, I measured and Mr. Kiser photographed a tree 175 feet high 

 and 16 feet 6 inches in girth, with a clean bole of about 60 feet, but I am unable to 

 reproduce this, as the negative has not arrived. 



The growth of seedlings in all the forests that I saw was exceptionally good. 

 Mr. H. D. Langille says,* p. 36 : — 



"Certain cone-bearers are better adapted for restocking than others, though the 

 reasons are not apparent. For example, young lovely firs i^A. amabihs) are abundant 

 everywhere within the zone of that species, whilst noble fir i^A. nobilis), having a 

 cone and seed of very similar size and nature, seldom germinates, and a seedling of 

 that species is rarely seen. 



' Mrs. Nicholl, who explored the Rocky Mountains in 1904 and 1905, tells me that it is a large tree at Glacier, on the 

 Canadian Pacific Railway, and grows up to about 5000 feet. 



^ Forest Conditions of CascaiU Reserve, p. 25, Washington, 1 903. 



3 Twenty-first Annual Report of the U.S. Geological Sun'ey, part v. Washington, 1900. 



•* Forest Conditions in Cascade Reserve, U.S. Geological Survey, Washington, 1903- 



