456 BOTANICAL GAZETTE [December 



metaphase with two centrosome-like structures (fig. 60) , ana- 

 phase (fig. 61) , and reaches telophase (fig. 62) while the lower 

 nucleus still remains in the resting condition. Sometimes the lower 

 nucleus divides first, showing metaphase with two centrosome-like 

 structures (fig. 63) and anaphase (fig. 64) while the upper nucleus 



rests. 



female gametangium 



mitoses occur in varying order; sometimes the nucleus of the basal 

 cell divides first (figs. 65, 66), sometimes that of the upper cell (figs. 

 67, 68), and sometimes that of the middle cell (figs. 69, 70), and 

 during these divisions 24 chromosomes are always seen in prophases 

 (figs. 65, 66, 69, 71). 



Up to the 4-celled stage the female gametangium divides 

 transversely, and then a perpendicular division occurs (fig. 72), so 



gametangium 



immediately 



gametangium 



gametangium of the 7-11-celled stage is not 



times in different cells. The 



may 



77, 79, 80, 83, 84), whose nuclei are either in the resting stage or in 

 prophase. The nucleus in prophase in any of these cells always 

 presents 24 chromosomes, and in metaphase two centrosome-like 

 structures are seen at the poles. It is remarkable that the chro- 



matin 



chromatin 



they are unable to connect them 

 In the young gametangia of the 



8-celled stage, the mitoses 

 take place as in earlier stages (figs. 85-88) ; the prophase and the 

 polar view of metaphase show clearly that the number of chromo- 

 somes is 24. One striking feature as contrasted with the male 

 gametangia is that in the female gametangia the nuclear diminution 

 in size is not very great during the repeated divisions and conse- 

 quent multiplication of cells of the gametangia. Of course the 

 nucleus at the time of the first division in the female gametangium 

 is rather large, especially in prophase (fig. 54), and the nucleus in 

 the prophase of the division in the female game tangium of the 1 8- 



