5i6 



General Botany 



tube to the egg. The female gametophyte retains its habit of 

 producing a prothallus and archegonia, though the latter are 

 greatly simplified and the prothallus is strictly a parasite. 



REFERENCE 



Coulter, J. M., and Chamberlain, C. J. Morphology of Gymnos perms. D. Ap- 

 pleton & Co., New York. 



>^' 



pollen sac Of 



or ovule 



t:% 



^^% 





SEED 



Fig. 323. Diagram ot life cycle of a conifer. 



