li 
Gradually the line widens, and it is seen that the wall of the mother 
cell has divided all round, and the cell above is slowly raised by the 
upwards, and thus as many as four, five, or six successive cells are 
ed, as indicated by the four, five, or six stri caps which may 
be counted at the apex of a cell. e number of caps correspond 
the number of cells produced in this manner consecutively immediately 
beneath the caps. Asexual reproduction takes place by the formation 
of a single zoospore in one of the cells of the filament. It is of a 
; en mature it escapes by rupture or fissure of the mother 
cell, moves about for a while, then becomes attached by the ciliated end, 
and ultimately develops into a young plant. 
; Sexual reproduction is varied in three ways. In th 
species the oogonium is an inflated cell, more or less globose, pi 
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The second 
litt] ects resemble the sterile females, except that they are usually a 
fl ethinner. The female filaments produce only the oogonia. The male 
wy nts, In certain abbreviated cells, give origin to the spermatozoids, 
oa In due time escape and fertilize the oospores of the female 
3 wa 
» Stain privileged cells of the female plants, whilst in the second 
: fe the male and female filaments are from the first distinct. The 
pet are called nannandrous species ; the latter macrandrous 
os The fert 
a through the folloy ing stages:—Previous to germination the 
Pe has an ege-sha gure; the cell-contents are densely crowded, 
; ed 
pr acomposed of minute brownish-green granules, closely sarees 
4 distinct cell-membrane. Outside this membrane there 1s fou 
“8 quite a distinct cell-membrane. Upon germination there are 
