A New Fir from Arizo7ia. 



117 



blunt, and notched at apex (about 25-30 millimeters in length) ; cones 

 dark purple, slender, medium, or rather small, those of type specimen 

 (not full grown) measuring about 50 x 20 millimeters ; scales much broader 

 than long, strongly convex laterally (Fig. 25, c), purple on both sides ; 

 bract (without awn) reaching to or past middle of scale; body of bract 

 much broader than long. 



Remarks. — The only tree with which the white cork-hark fir 

 needs comparison is the subalpine fir (Abies lasiocnrpa Hooker = 

 A. snhalpina Engehn.), from which it differs in leaves, bark, and 

 cones. In Abies lasiocarpa the leaves of the lower branches aver- 

 age much shorter than in A. arizonica; the bark is hard instead 

 of elastic-corky, and is variable in color, usually dark grayish 

 brown blotched with whitish ; the 

 cones are larger, and the scales and 

 bracts differ widely in shape and 

 proportions. In A. lasiocarpa (Fig. 

 25, a and b) the scales are longer 

 than broad, the body of the bract 

 is less than one-third the length of 

 the body of the scale, and the seed 

 wings are about twice as long as 

 broad ; in A. arizonica (Fig. 25, c) 

 the scales are much broader than 

 long, the body of the bract is more 

 than half the length of the scale, 

 and the seed wings are about as 

 broad as long. 



The form of the scale and relative 

 size of the bract ^jrobably change 

 somewhat with age, but in the ac- 

 com})anying figures the immature 

 scale of Abies arizonica (Fig. 25, c) is contrasted with a still 

 younger scale of A. lasiocarpa (6), as well as with the mature 

 scale of the latter (a). The young cone of A. lasiocarjxi, from 

 which the scale figured (b) is taken, is decidedly smaller than 

 the cone of J. arizonica, from which figure c is taken, while the 

 adult cone of A. lasiocarpa is more than twice as large. Both of 

 the specimens figured of A. lasiocarpa came from Mount Hood, 

 at the north end of the Cascade Range in Oregon, which is prob- 

 ably near the type locality of the species. I am indebted to 

 Mr. F. V. Coville for the opportunity of figuring the young cone 



Fig. 25.— Scales of cones (natural size). 



a. Abies lasiocarpa, mature. 



b. Abies lasiocarpa, young. 



c. Abies arizonica, young. 



a, b, c. Upper side, showing seed wings. 

 a', b', c'. Under side, showing bracts. 



