TETRAPLOIDS 



125 



by Elie and fimile Marchal by artificial means. Each 

 moss plant has two generations, a haploid protonema 

 stage (gametophyte) that produces eggs and sperm-cells 

 and a diploid stage (sporophyte) that produces asexually 



© • XlTl) 



X(Tl) 



x(m 



Xy(2Tl) Sporophyte 



X(TD Gametophyte 



lerna 



@ mm ®xm) 



Fig. 78. 

 Normal life cvele of dioecious moss. 



