is spirogyra kingdom or domain
exists and is an alternate of. Merge this question into. Split and merge into it. Answer by Jpfromthecoast. Confidence votes 11. Spirogyra is a common genus of filamentous algae, therefore it is in the kingdom Protista.pirogyra are decomposers which breakdown dead organic matter. This  is green algae which used conjugation as the method of  reproduction.