416 BOTANICAL GAZETTE [DECEMBER 
cells, as shown in diagram 3. The pericentral cell, which was the 
progenitor of the carpogonial branch and lies beneath the carpo- 
gonium (because of the growth and bending of this structure), now 
gives rise to two cells (diagram 3, ar, a'r), one somewhat below and 
the other at the side. The cell below divides once (diagram 3, a’I, a’2). 
The cell at the side develops a branching group which lies close beside 
the carpogonial branch, as shown in 
diagram 3 (a 1,4 2,a2',a 3,a3). One 
of these auxiliary cells (a 3) is formed 
between the fertilized carpogonium 
and the pericentral cell. Thus the 
final result is two series of auxiliary 
cells, one consisting of five, the other 
of two cells; and in the former series 
it should be remembered that one of 
them has an important function, as 
will appear later, becoming the path of 
communication between the fertilized 
carpogonium and the pericentral cell. 
Puriires (60) in his studies on the 
Rhodomelaceae recognized many fea- 
tures in the structure of the procarp of 
Polysiphonia which I have just de- 
scribed. His account of a four-celled 
carpogonial branch is correct, together 
with the general account of the for- 
Pera oo hetadd mation of the central cell, as will be 
cells: pe, separ cell; yr described presently. However, I was 
a2’, a3, a3’, a’1, a’2, auxiliary cells; not able to find the arrangement of 
, 2, 3, cells of carpogonial branch; the auxiliary cells as he has described 
Oh Of OEE them, and his investigation lacks the 
cytological details through which the nuclei that enter the carpospore 
must be traced. 
uoydis jx + 
FERTILIZATION AND DEVELOPMENT OF THE CYSTOCARP. 
The jusion of the gamete nuclei—The male and female gamete 
nuclei which met in the carpogonium have generally fused by the time 
