- (2) Those which are unable to germinate of themselves, but fuse with another cell, the product giving rise to a new individual; these are sexual and are zoogametes (Gr.
- When two similar zoogametes fuse, the process is conjugation, and the product a zygospore (Gr. ?"vy6, yoke).
- It is known that zoogametes, which usually conjugate, may, when conjugation fails, germinate directly (Sphaerella).