126 BUDS AND STIPULES 



and open on the side towards the stem ; the second is 

 longer, and narrower in proportion. 



Several of the species secrete a gum, which forms 

 an additional protection to the bud. 



the lime (Tilia) 



In the Lime (Tilia vulgaris) (PI. I. fig. 1) the 

 pseudo-terminal and lateral buds are very similar. 

 They are generally lop-sided or tumid on one side, 

 owing to the thickening of the small outer scale, 

 particularly along the midrib. The true apex of the 

 shoot becomes disarticulated and falls off. The bud 

 does not lie opposite the centre of the leaf, but a little 

 on one side. As already mentioned (ante, p. 9), this 

 occurs in other trees, as, for instance, in the Beech and 

 Hornbeam (fig. 11). The consequence is that the 

 pseudo-terminal bud has a scar on each side of it 

 one that of its leaf, the other that of the fallen shoot. 



The scales of the winter-bud are arranged on 

 alternate sides of the bud, the leaves being alternate 

 and distichous. The outer scale overlaps the second at 

 the base, but is little more than half its size, though 

 two-thirds the length of the bud. The first two are 

 coriaceous, glabrous, and not accompanied by a leaf; 

 they are also obtusely and slightly carinate. Some- 

 times one stipule of the outer pair is absent. 



The next two are larger, more nearly equal in 

 size, roundly cordate; showing an inclination to 



