214 CYTOLOGY chap. 



generations. Although the examples mentioned as illustrating the 



Certain of the 

 Phaeophyceae^ 



( Diclyola l 

 and (Meiosis 

 Rhodbphyceae 

 (Polys i phonia ) 



M CIO SIS 



Syngamy---y- 



Bruophyla 



Syngamy 



B 



Agyrvgata 

 DiplocysUs 



Certain of Ik 

 Phodophyceae. 

 [Kemalicnes) 



Syngamy 



If 



Meiosis 



Pteridophyla 



Meiosis 



\ 



Syngamy 



Metazoa and 



certain oj the 



Rhodophyceae. 



(Fucas ) 



Laslrea 

 Pseudomas 

 i/ancristala 



fit 



Fig. 91. 



Parthenogenesis 

 and budding m 

 Animals and Plants 



Diagrams illustrating the relations of the haploid and diploid phases in various organisms. 

 In each case the single line represents the haploid, and the double line the diploid, condition. 



different stages manifestly do not in most cases form a phylogenetic 

 series, yet in the main it is probable that the condition shown in Fig. 



