18 



4 alternation of generations '. This is represented 

 in a graphic manner below : 



PROTHALLUS 

 (Sexual Plant) 



\ 



Archegonium Antheridium 



Spore 



I 



Egg-cell Sperm 



I 



Sporangium 

 Fertilized 

 Egg-cell 



\ 



Fern Plant 

 (Asexual Plant) 



4. VEGETATIVE REPRODUCTION 



Besides the sexual reproduction illustrated 

 in the life-history described above, many ferns 

 are capable of reproducing themselves vegeta- 

 tively. Thus the fronds of Adiantum cauda- 



