IQI2] 



YA MA NO UCHI—C U TLERIA 



465 



occurs frequently without any elongation of the sporeling. When 

 the nucleus is in prophase there seems to be no departure from the 

 typical mitosis characteristic of Cutleria, the division being per- 

 fectly normal. The number of chromosomes appearing in prophase 

 is 24 (fig. 126). At metaphase two centrosome-like structures 

 appear at the poles (fig. 127), and the number of chromosomes is 

 clearly 24 (fig. 128). Some- ^ 



times the metaphase is 

 reached while a part of the 

 sporeling is elongating (fig. a 



13°). 



1 



The chromosomes 

 split longitudinally and half 

 of each chromosome passes 

 to each pole (fig. 131). The J^?^5 

 axis of the first mitotic figure 

 may be either longitudinal or 

 transverse to the axis of the 



b 



sporeling (figs. 132 



> 



133)- 





3 



f 



After telophase two new 

 daughter nuclei are formed 



(%• 134)- In the sporeling 



of the unfertilized female ^ ^ Ml . .,.-, 



Fig. 11. — Cutleria muUtfida: apogamous 

 gamete beautiful radiations sporelings: a } 30 days after germination ; b, 



are closely associated with 50 days after germination; d, 75 days after 



the upper nucleus (fig. ik) germination (d represents a part of a spore- 



r . .1 £ v ^ n & un( ter the same magnification as a and i, 



but they are of short dura- a nd the whole of the sporeling is shown in c) ; 



tion, and disappear com- the apogamous sporelings are slow in develop- 



pletely when the nucleus ment as com P are ^ w^h the normal ones, and 

 ^ nnn - , , /r - x assume massive forms at first and then the 



passes into prophase (fig. 136). flat ^ expansion like the normal ones . 

 When the upper nucleus is in 



metaphase (fig. 137), the lower nucleus enters into prophase. 

 Both the metaphase, viewed from pole (fig. 137), and the prophase 

 show 24 chromosomes. One peculiarity observed is the appearance 

 of elongated chromosomes in the upper nucleus of a 2-celled spore- 



ling during prophase 



or 



138). The division of the upper and 



lower nuclei is not simultaneous; sometimes the upper nucleus 

 is far ahead of the lower, so that the former is in late telophase 



