29 



Shoshoue Mountains, Cassia County, southern Idaho, and from the Independence 

 National Forest, northern Nevada. Further and more detailed reports are 

 desired from these stations. 



White fir has been reported provisionally in the Blue and Powder River 

 mountains, northeastern Oregon, but further observations or specimens are 

 required for confirmation. The northern limit of white fir in Colorado is also 

 still undetermined. Field notes of George B. Sudworth, S. B. Detwiler, J. H. 

 Ramskill, and J. G. Jack, of the Arnold Arboretum, have established its pres- 

 ence on the eastern slope of the front range as far north as Plum Creek, a 

 tributary of the South Platte River, and probably also in the Leadville National 

 Forest, but it is not known to have been observed in the Medicine Bow, Holy 

 Cross, Gunnison, Uncompahgre, nor Battlement Mesa National Forests, although 

 it is more or less common in the National Forests to the south. The only sta- 

 tion reported for this fir in the White River National Forest was found by 

 George B. Sudworth in 1898, on the western border of the reserve near Canyon 

 Creek, a tributary of the Grand River. 



Amabilis fir (Abies amabilis). There appears to be some confusion in regard 

 to what firs occur on the western slopes of the Coast Range of southern Alaska 

 and British Columbia. Abies amabilis and A. lasiocarpa are the only firs pos- 

 sible in that region. The alpine fir is apparently not found at all on the sea- 

 ward side of the Coast Range, nor on Vancouver Island, although it is abundant 

 on the eastern slope of the Coast Range and throughout the interior plateau of 

 British Columbia, while farther north it crosses White Pass and descends to 

 sea-level at Lynn Canal. Between this and Boca de Quadra Inlet no fir has 

 been found on the coast, and the species which extends thence southward on 

 the Coast is Abies amabilis. Whether or not it extends southward to the United 

 States on the seaward side of the Coast Range of northern British Columbia is 

 at present unknown, for records of it on Queen Charlotte Islands and for the 

 territory between Alaska and the northern end of Vancouver Island are want- 

 ing. It is common, however, on Vancouver Island and on the opposite main- 

 land. 



Noble fir (Abies nobilis). The actual southern limit of Abies nobilis, pre- 

 sumably not south of Oregon, is believed to be unknown at present. Browder 

 Ridge, in Lane County, on the headwaters of McKinzie River, a branch of the 

 Willamette River about halfway down the State, has heretofore been the 

 southmost point at which this tree has been observed. It may well be looked 

 for, however, as far south as the north line of California, since authentic speci- 

 mens, recently collected by A. E. Cohoon and Raphael Zon on the north side of 

 the Siskiyou Mountains in the Ashland National Forest, have been identified 

 in this office as Abies nobilis. Reports of it have been made previously at 

 Crater Lake and in the Cascades and Coast Mountains. 



Alpine hemlock (Tsuga mertensiana) . The northern and western range of 

 Alpine hemlock in Alaska has been extended recently by W. A. Langille, and 

 by W. H. Osgood, of the Biological Survey. Mr. Langille found it in the upper 

 forest of the coast country from Lynn Canal westward to Prince Williams 

 Sound, where it descends to sea level, and thence from sea level to timber line 

 extends along the eastern shores of the Kenai Peninsula to Resurrection Bay 

 and across the Peninsula to Turnagain Arm of Cook Inlet, being observed here 

 also by Mr. Osgood. In this locality it reaches its western and northern limits 

 in latitude 61 10', longitude 150, at the head of Yukla Creek on the north 

 slope of the divide between Turnagain Arm and Knik Arm. 



In Washington the distribution of alpine hemlock is still imperfectly known 

 and requires further careful observations to clear up several doubtful points. 

 For example, it is abundant in the Olympic and Cascade mountains, but it 



