GYMNOSPERMS. 153 
About the first of April the blepharoplasts have reached nearly one- 
half the size they finally attain. They are more or less vacuolate, and 
the kinoplasmic radiations, which have become more abundant, extend 
in many instances quite to the plasma membrane of the cell. 
After further growth the generative cell divides into the two cells 
which develop into the two spermatozoids (Fig. 61, B, and Fig. 62). 
The blepharoplasts take no part in the division of the nucleus. Al- 
though their kinoplasmic radiations become fewer, they do not enter 
into the formation of the 
spindle, as the latter devel- 
ops apparently entirely 
within the nucleus, and is 
almost mature before the 
nuclear membrane has dis- 
appeared. In the spindle 
stage of this division the 
blepharoplast is seen to 
have undergone a noticeable 
change. It has increased in 
size and its outer membrane 
has separated from the con- 
tents, which are somewhat 
shrunken. The outer mem- 
brane has separated into 
fragments or plates, and 
appears now as a broken 
line (Fig. 61, B). The 
kinoplasmic radiations have Fic. 62.—Prothallium of Zamza in which the generative 
almost disappeared. The cell has divided. 
reticulum of the cytoplasm The blepharoplasts have separated into granules which are 
: beginning to organize the ciliferous band. ‘Ihe first 
about the blepharoplast 18 prothallial cell and stalk cell have become gorged with 
so arranged as to suggest starch. (The magnification of this figure is only one- 
radiations. It will be half that of A, Fig. 61.)—(After Webber.) 
remembered that precisely the same phenomenon occurs in Cycas. 
During the anaphase of division the finer structure of the outer 
membrane, which still consists of a number of segments, is seen to be 
made up of numerous small granules placed side by side to form the 
membrane. The central contents, which stained very densely at an 
earlier stage, have disappeared, giving place to a delicate hyaline 
reticulum (Fig. 61, B). Webber suggests that the densely staining 
material which resembled nucleoli in its staining qualities was utilized 
