Doubtful according to GBIF classification (Possible variant of Rhizosolenia eriensis (W. & G.S.West) Skabichevskii, 1960)
Rhizosolenia eriensis var. stagnalis (Zacharias) Cleve-Euler 1940
Homotypic synonym according to GBIF classification (Originally found in sources as synonym of Rhizosolenia longiseta var. stagnalis Zacharias, 1899)
Rhizosolenia imbricata var. striata (Greville) Grunow 1882
Homotypic synonym according to GBIF classification (Originally found in sources as accepted taxon within Rhizosolenia imbricata Brightwell, 1858)
Rhizosolenia longiseta f. levanderi Cleve-Euler 1915
Homotypic synonym according to GBIF classification (Originally found in sources as doubtful taxon within Urosolenia longiseta (Zach.) M.B.Edlund & Stoermer)
Rhizosolenia magna Stuwe 1909
Doubtful according to GBIF classification (Possible variant of Rhizosolenia magna G.I.Hansen, 1911)
Rhizosolenia minima Schrader 1976
Doubtful according to GBIF classification (Possible variant of Rhizosolenia minima Levander)
Rhizosolenia obtusa Ostenfeld 1903
Doubtful according to GBIF classification (Possible variant of Rhizosolenia obtusa Hensen, 1887)