CHAP. 



214 CYTOLOGY 



generations. Although the examples mentioned as illustrating the 



Certain of the 

 Phaeophyceae^ 

 ( Dicluola l 



and (MeiOSLS 



Rhocbphj/cem 

 (Polijsi phonia ) 



McLOSis 



Syng(imy---y--- 



k 



Brubphyia 



B 



Syngamy 



Aggregala 

 Diplocgslis 



Certain of Ihe 

 Rfwdophyceae. 

 [Kemalicnes) 



Syngamy 



II 



Meiosis 



Syngojny 



Pteridophyla 



V 



Syngamy 



Phaneroga rns 



Meiosis 



\ 



Syngamy 



Metazoa and 



certain of the 



Rhodophyceae. 



(Fllclls ) 



Lastrea 

 Pseudomas 

 vancristala 



A' 



Fig. 91, 



Parthenogenesis 

 and budding in 

 Animals andPlants 



F" 



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. 



