ON THE STRUCTURE OF BUDS 



157 



In the Spruce Fir (Picea excelsa) the winter-buds 

 (fig. 276) vary greatly in size, those at the apex and 



270 



277 I 278 



279 



280 



281 



282 



283 



284 



285 



SPRUCE FIR (Picea excelsa), x 3. 



FIG. 276. Apical and two lateral buds ; p.L, pedestals of leaves after the 

 green portion has been removed. FIG. 277. Normal and perfect leaf : /,leaf : 

 p, pedestal ; 6, basal portion decurrent upon the axis. Fiu. 278. Slightly 

 modified small leaf ; I, leaf ; p and 6, pedestal and base merged in one another. 

 FIGS. 279, 280. Leaves now modified to triangular acuminate scales with a 

 midrib. FIGS. 281, 282. Succeeding forms of scales. FIGS. 283, 284, 285. 

 Inner scales after they have elongated, about the middle of April ; I, I, in 

 Figs. 283, 284, would seem to represent the lamina, surmounting elongated 

 pedestals : the same portion in Fig. 285 is hooded over the apex of the bud ; 

 the lower portions are membranous and transparent. 



