APOGAMY AND APOSPORY 



439 



endosperm is sexually produced, while the other generative nucleus 

 does not fuse with the egg cell (Pace, 1913). 



{b) Apogamy, the development of cells other than the egg cell 



ApOMIXIS in i2^ANGIOSPERMS 



Somatic Cell 



2nl 



Och 



'na. 



§1 ntirum^^ 



Hieraciunt 

 . Pthsella 



Taraxacum \ 









5n .^ S 'c^ Sh 



^ 





I 







Fig. 130. — Diagram of different forms of apomixis found in the 

 flowering plants. Unbroken lines show the course of sexual 

 reproduction, broken lines, of apomixis. The species given are not 

 all fixed in the particular kind of apomixis here assigned to them 

 [cf. Table 68). N.B. — The normal embryo (2w) is derived from 

 a nucleus of the embryo-sac (ES) and of the generative 

 nucleus (GN). 



into the embryo sporophyte, is probably not very important. The 

 synergids and antipodal nuclei have been supposed to give rise to 

 supernumerary embryos in the facultatively parthenogenetic 

 Allium odorum (Haberlandt, 1923). In order to give diploid 



