SEED-BEARING PLANTS 



OUTLINE OF LIFE HISTORY OF PINUS 



431 



Oosperm 



44 



Embryo (In a seed > 

 (Zygote) 



44 



Embryo-rests 



44 



Germination of seed 



44 



Mature sporophyte (The pine tree) 



385. Comparison with Lower Forms. It will be spe- 

 cially instructive, at this point, for the student to make a 

 careful comparison of the life history of Pinus with the 

 lower forms, such as Cycas, Selaginella, Lycopodium, Equir 

 setum, and a true fern, noting especially the relative impor- 



