3O0 



MORPirOLOGY. 



When the pollen is mature, the moisture dries out oT the scale 

 (orslamen, as it is often calletl here) while 

 it ripens. A\'iien a limb, bearing a duster 

 of male rones, is jarred by the hand, or b\" 

 currents of air, the split suddenly opens, and 

 a cloud of pollen Ijursts out from the numer- 

 ous anther locules. The pollen is 

 thus borne on the wind and some of 



it falls on the 



female flowers. 



Fig. 344. 



White pine, braiicli with cluster uf 

 mature coue.s shedding llie seed, A 

 lew young cones four months old 

 ,u-e sliown on branch at the left, 

 Ilrawti from phott)graph, 



613. Form of the ma- 

 ture female cone. — A 



cluster of the white- 

 pine cones is shown in 

 hg. 344. These are 

 mature, and the scales 

 have sjjtead as they do when mature and becoming dry, in 

 order that the seeds may be set at liberty. The general out- 



I I, u^ 



Mature cone nl white pine 

 at time of scattering of the 

 seed, nearly natural size. 



