Spirogyra species can reproduce both **** and asexually. Asexual, or vegetative, reproduction occurs by simple fragmentation of the filaments. ** reproduction occurs by a process known as conjugation, in which cells of two filaments lying side by side are joined by outgrowths called conjugation tubes.
In spirogyra, ** reproduction takes place by conjugation. The fusion process of two opposite strains (positive, negative) cells is called conjugation.
