PINACEiE 



457 



1-4 in. long, short-pointed, margins minutely toothed, glaucous 

 with many well-defined lines of stomata on the flat, inner surface, 

 green with interrupted lines of stomata on the outer side ; resin 

 canals marginal ; basal sheath at first white and ^ in. long, becom- 

 ing grey and shorter later. Cones solitary or 2-3 together, 

 variable in shape but usually ovoid-conic, symmetrical or oblique, 



x20 



Fig. \QQ.—PINUS SYLVESTRIS. 



a, branchlet, with winter bud ; b, winter bud and bases of leaves ; 

 d, section of leaf, showing marginal resin canals ; 



c, apex of serrulate leaf ; 

 e, seeds. 



greyish or dull brown, 1-3 in. long, on short stalks ; scales 

 narrowly oblong, the exposed portion flat or protruding, often 

 much more prominent on the outer than on the inner side of the 

 cone, the apex terminated by a minute prickle or its remains. 

 Seeds oval, ^-j, in. long, blackish or dark grey, with a wing about 

 three times the length of the seed. 



The following varieties have been described, but do not appear 



