THE GYMNOSPERMAE : CONIFERALES AND TAXALES 691 



Fig. 692. — Pimis sylvestris. 

 Mature female cones in 

 the third year, opening 

 to Hberate seeds. 



Fig. 693. — Pinus sylvestris. Germination. 

 A, Longitudinal section of the seed 

 showing a straight embryo surrounded 

 by endosperm. B, Germination of 

 seed. C, Liberation of numerous 

 cotyledons from the seed and growth 

 of the primary root. (After Sachs.) 



