I9i 2] 



YA MA NOUCHI—C U TLERIA 



455 





gametangium initial 



Sometime 



third division is intercalated between the first division occurring 

 in the superficial cell and the formation of the gametangium initial, 

 and in this case the female gametangium, instead of having a stalk 

 of a single cell, has a stalk consisting of two (fig. 7, a) or three cells 

 (fig. 7, b). Or a 



number 



filament and some 



filament divides laterally to form 

 a branch which becomes a erame- 



*>. 



/ 



initial 



ame 



The nucleus of the ^ 

 tangium initial increases greatly 

 in size, as in the case of the male 

 gametangium initial. In it there 

 is contained a large number of 

 plastids. The chromatin net- 

 work of the nucleus, which is 

 composed of irregular knots and 

 scanty fibrils during the resting 

 sta ge, gradually increases in 



itin content, and finally 

 there is established a prophase 

 ( n S- 54) containing 24. chromo- 





i 



• * * 



-* 



V 





& 



/ 



*• • 



* 4 



i 



■ 



* ft - * 



/ 



I 





; 



\ 





> 



\ 



a 



chrom 



6 



d 



, — Ciitleria 



sketched from living material; a, male 

 SOmes and a single nucleolus. gamete; b, female gamete; c, female 



metaphase the volume 

 :leus diminishes consid 



gamete which has become quiescent and 



germinating 



(fig- 55), 



compare 



apogamously. 



some-like structures appear at the 

 poles. While the nuclear figure is still intranuclear, the chromo- 

 somes split longitudinally and half of each chromosome passes to 

 each pole (fig. 56). At telophase two daughter nuclei are formed, 



between them. The cell plate is 



r emai ns 



gement 



asm 



Each nucleus of the two cells grows in 



multaneou 



the rates of the mitotic processes in these two nuclei diverge; the 



chromosomes 



