THE LIFE HISTORY OF FERNS 



13 



takes place, so that although in size an adult Fern may be as small 

 as a tiny tuft of grass or, on the other hand, rival a majestic Palm, 

 by its tall trunk and widespread plume of frondage, at the outset 



■'A - -•!•/■- 'i .••< J 

 1 • ri /'A '"'■ 



Fig. 4. — Development and fertilization of Archegonia. 



they may be quite indistinguishable, and the spores in every case 

 are microscopic in sizey 

 With these preliminary remarks indicative of the past history 



