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xy(An) 



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Fig. 79. 



Formation of a diploid protonema (2n) by regeneration from a 

 2n sporophyte of a normal, monoecious moss. By self-fertilization 

 a 2n gametophyte gives rise to a tetraploid or 4n sporophyte. By 

 regeneration from the latter a tetraploid gametophyte is produced. 



