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 



279 



280 



281 



282 



283 



284 



U 



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 ; b, basal portion decurrent upon the axis. Fig. 278. Slightly 

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

 Fk;s. 279,280. Leaves now modified to triangular acuminate scales with a 

 midrib. Figs. 281, 282. Succeeding forms of rales. PIGS. 283, 284, 285. 

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

 Rga, 283, 284, would seem to represent the lamina, surmounting elongated 

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

 the lower portions are membranous and transparent. 



