Holden arid Harper—Nuclear Phenomena , 69 
and that the daughter nuclei are distributed as indicated above. 
More than this is not shown by the figures. 
While it was impossible to study the details of the process of 
cell division, it is clear that there is no formation of a cell plate 
and that the cell divides by constriction (Fig. 22). The divis¬ 
ion is, in general, of the type described by Strasburger (13) 
for Cladophora. There is nothing whatever in the cytoplasm to 
indicate the direction in which the cleavage furrow is to pro¬ 
ceed and in this the process differs from that described by Mot- 
tier for Dictyota\ (9). 
In the teleutospore we find the conditions much more favor¬ 
able for the study of the nuclear phenomena. The young tel¬ 
eutospore is a single cell and contains two' nuclei formed by 
the division of a pair of nuclei in the mother cell as described 
above. Shortly after the young teleutospore is cut off from the 
mycelium by a cross wall, the nuclei increase rapidly and con¬ 
siderably in size. In a majority of cases they probably 
at least double their volume. They may lie in any position 
whatever with reference to> the axis of the cell (Fig. 3). This 
condition is in marked contrast to that, which we find when the 
nuclei are about to divide when, as noted, they always lie side 
by side in the transverse axis of the cell. The nuclei after in¬ 
creasing in size approach each other till they touch (Fig. 11). 
At this stage they have lost the appearance, which is character¬ 
istic of the conjugate nuclei. They are much less dense and 
seem to contain more of the so called nuclear sap. The threads 
of chromatin, quite uniform in size, have become evenly dis¬ 
tributed so that there is no longer a clear space about the nu¬ 
cleoli (Fig. 11). The first step in actual fusion is the disap¬ 
pearance of the definite outline of the individual nuclei at their 
point of contact. This is caused by the disappearance of the 
nuclear membrane. By the loss of the membrane at this point 
of contact the contents of the two nuclei come together and 
mingle so that no line, of demarcation between them can be dis¬ 
covered. The nuclei continue to crowd closer together. The 
area of contact is thus increased and as fast as contact is made 
the membrane disappears. This process continues till we have 
a single oval nuclear mass. At every other 1 point except the 
