TAXONOMY 
237 
ments arrange themselves side by side, and the cells lying opposite 
each other undergo internal changes so as to form gametes or sexual 
cells. Each protrudes a process or conjugation tube ; these unite 
Fig. 114 .—Spitogyra sp. A, terminal portion of vegetative filament; B, stages 
of scalariform conjugation; C, preparation for lateral conjugation; D, zygospores 
formed by lateral conjugation. {Gager.) 
and the protoplasm from one cell passes over and coalesces with that 
in the cell opposite. The result of the processes a new cell called a 
zygospore or zygote. This is set free by decay of the walls of the old 
