Several names share this combination and are defined under the rules of the botanical code. The species name Polysiphonia opacea might be an homonymy case.

Polysiphonia opacea Zanard.

Botany

Polysiphonia opacea Ag.

Botany

Polysiphonia opacea Suhr in litt.

Botany

Polysiphonia opacea Mont.

Botany