y- Measles ee? Ll 
tt ee Ce Le Sas 
po dense yi 1 a eC 
1909] YAMANOUCHI—CUTLERIA AND AGLAOZONIA 383 
to grow. The growth usually proceeds until the cell becomes two 
or more times as large as the corresponding cell of the male plant. 
Curiously enough the nuclear growth does not keep pace with that 
of the cell; in other words, the nucleus in the superficial cell at the 
time of division has almost the same dimensions as in the male plant, 
and this equality persists up to the formation of mother cells. 
The first division of the superficial cell is followed by two or more 
divisions, which result in a short filament whose terminal cell becomes 
a female gametangium. A number of divisions in the gametangium 
produces eventually a structure composed of regularly arranged 
mother cells. 
The nucleus and cytoplasm in the mother cell undergo changes 
similar to those of the male plant, and after a rearrangement of the 
plastids a female gamete is formed by the transformation of the 
Whole protoplast. The female gamete, thus formed and containing 
24 chromosomes, is discharged from the mother cell. 
FERTILIZATION AND GERMINATION 
As has been stated, the nuclei in both male and female gametes 
Contain 24 chromosomes. When the female gamete loses its motility 
and becomes quiescent, a free swimming male gamete becomes 
attached to it and the union of the two. protoplasts occurs. For the 
sake of brevity, the details of the fusion of the two nuclei, following the 
union of the gametes, will be omitted in this note. 
The fusion nucleus in the common mass of male and female cyto- 
Plasm rests for a certain length of time. The first segmentation 
division takes place within twenty-four hours or less after the union 
of the gametes. So long as the fusion nucleus remains in the resting 
State, the round contour of the sporeling is still kept, but when the 
nucleus has begun to show the early prophase, there is noticed at once 
at a certain part of the sporeling a slight protuberance, and the cell 
wall of the protuberance is seen to be considerably thickened. The 
axis of the mitotic figure of the first segmentation is always parallel 
With the elongated direction. 
The number of chromosomes appearing in the prophase is 48. 
_When these chromosomes become arranged in the equatorial plate, the 
intranuclear figure is well marked between the kinoplasmic masses 
