2i 4 CYTOLOGY 



generations. Although the examples mentioned as illustrating the 



Certain of the 

 Phaeophyceae l 

 (Diclyolaj 

 and (Jfa 



(^J/^honia)\\. // 



A 



Meiosis 



Bruophyla 



B 



Aggregate 

 Diplocystis 

 Certain of the 

 Rhodophyceae. 



(Nemalicnes) 



Syngamy 



jyngamy 



Pteridophyla 



^^ , 



V 



any 

 Phanerogams 



Syngamy 



II 



Meiosis 



MelcLzoa and 



certain of the 



Wwdopkyceae. 



(Focus) 



Lastrea 



Pseudomas 

 yancristala. 



A 1 



FIG. 91. 



Parthenogenesis 

 and budding in 

 Animals and Plants 



F 1 



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. 



