GYMNOSPERMS: WHITE PINE. 



301 



line of the cone is lanceolate, or long oval, and somewhat 

 curved. It measures about io-i$cm long. If we remove one 



Pig. 346. Fig. 347- Fig. 348. Fig. 349- '> Fig. 35- 



Sterile scale. Scale with Seeds have Back of scale $ Winged 

 Seeds undevel- w e 1 1 - developed split off from with small cover ^ 'seed free from 

 oped. seeds. scale. scale. .scale. 



Figs 346-350, White pine showing details of mature scales and seed. 



of the scales, just as they are beginning to spread, or before the 

 seeds have scattered, we shall find the seeds at- 

 tached to the upper surface at the lower end. 

 There are two seeds on each scale, one at each 

 lower angle. They are ovate in outline, and 

 shaped somewhat like a biconvex lens. At this 

 time the seeds easily fall away, and may be 

 freed by jarring the cone. As the seed is 

 detached from the scale a strip of tissue from 

 the latter is peeled off. This forms a " wing " 

 for the seed. It is attached to one end and is 

 shaped something like a knife blade: On the 

 back of the scale is a small appendage known 

 as the cover scale. 



614. Formation of the female pine cone. The female 

 flowers begin their development rather late in the spring 

 of the year. They are formed from terminal buds of 

 the higher branches of the tree. In this way the cone 

 may terminate the main shoot of a branch, or of the 

 Fig. 351. lateral shoots in a whorl. Aftergrowth has proceeded 



Female cones of the for some time in the spring, the terminal portion begins 

 pme at time of pollina- 

 tion, about natural size, to assume the appearance of a young female cone or 



