• Rhizoclonium Kützing, 1843
• Rhizoclonium affine Kützing, 1849 accepted as Chaetomorpha ligustica (Kützing) Kützing, 1849
• Rhizoclonium africanum Kützing, 1853 accepted as Pseudorhizoclonium africanum (Kützing) Boedeker, 2016
• Rhizoclonium ambiguum (Hooker f. & Harvey) Kützing, 1849 accepted as Rama incompta (Hooker f. & Harvey) Boedeker, M.J.Wynne & Zuccarello, 2023
• Rhizoclonium angulatum Kützing, 1849
• Rhizoclonium antillarum Kützing, 1849
• Rhizoclonium aponinum (Pollini) Kützing, 1845 accepted as Rhizoclonium hieroglyphicum (C.Agardh) Kützing, 1845
• Rhizoclonium arboreum Zeller, 1873
• Rhizoclonium arenosum (Carmichael) Kützing, 1849 accepted as Chaetomorpha ligustica (Kützing) Kützing, 1849
• Rhizoclonium berggrenianum Hauck, 1887
• Rhizoclonium biforme Kützing, 1849 accepted as Chaetomorpha ligustica (Kützing) Kützing, 1849
• Rhizoclonium bolbogoneum Montagne
• Rhizoclonium breve Ichihara & Miyaji, 2013
• Rhizoclonium calidum Kützing, 1853
• Rhizoclonium capillare Kützing, 1847 accepted as Chaetomorpha capillaris (Kützing) Børgesen, 1925
• Rhizoclonium casparyi Harvey, 1851 accepted as Chaetomorpha ligustica (Kützing) Kützing, 1849
• Rhizoclonium chelonum (Collins) R.Ciferri, 1934 accepted as Arnoldiella chelonum (Collins) C.Boedeker, 2012
• Rhizoclonium chelonum subsp. antillarum R.Ciferri, 1934
• Rhizoclonium confertum Ichihara & Miyaji, 2013
• Rhizoclonium crassipellitum West & G.S.West, 1897
• Rhizoclonium crassipellitum var. robustum G.S.West, 1904
• Rhizoclonium crispum Kützing, 1845
• Rhizoclonium curvatum V.J.Chapman, 1956
• Rhizoclonium dimorphum Wittrock, 1884
• Rhizoclonium erectum F.S.Collins, 1900
• Rhizoclonium fissum F.Brand, 1911
• Rhizoclonium flavicans (Mertens) Rabenhorst, 1868
• Rhizoclonium fluitans Kützing, 1853 accepted as Rhizoclonium crispum Kützing, 1845
• Rhizoclonium fontanum Kützing, 1843
• Rhizoclonium fontinale Kützing, 1845
• Rhizoclonium fontinale f. striatum Filarszky
• Rhizoclonium fontinale var. rivulare Kützing, 1845 accepted as Cladophora rivularis (Linnaeus) Kuntze, 1891
• Rhizoclonium fractiflexum A.Gardavskýy, 1993
• Rhizoclonium fractum Ichihara & Miyaji, 2016 accepted as Pseudorhizoclonium fractum (Ichihara & Miyaji) Boedeker, Leliaert & A.R.Sherwood, 2019
• Rhizoclonium giganteum H.Silva, 1953
• Rhizoclonium grande Børgesen, 1935
• Rhizoclonium guyanense Crouan & Crouan, 1868 (uncertain)
• Rhizoclonium hieroglyphicum (C.Agardh) Kützing, 1845
• Rhizoclonium hieroglyphicum subsp. longiarticulatum Wille, 1901 accepted as Rhizoclonium hieroglyphicum var. longiarticulatum (Wille) Margalef, 1953
• Rhizoclonium hieroglyphicum var. crispum (Kützing) Rabenhorst, 1868 (uncertain)
• Rhizoclonium hieroglyphicum var. dimorphum (Wittrock) Stockmayer, 1890
• Rhizoclonium hieroglyphicum var. hosfordii (Wolle) F.S.Collins, 1909
• Rhizoclonium hieroglyphicum var. longiarticulatum (Wille) Margalef, 1953
• Rhizoclonium hieroglyphicum var. riparium (Roth) Stockmayer, 1889 accepted as Rhizoclonium riparium (Roth) Harvey, 1849
• Rhizoclonium hieroglyphicum var. tortuosum (Dillwyn) Stockmayer, 1890 accepted as Rhizoclonium tortuosum (Dillwyn) Kützing, 1845
• Rhizoclonium hieroglyphicum var. typicum De Toni accepted as Rhizoclonium hieroglyphicum (C.Agardh) Kützing, 1845
• Rhizoclonium hieroglyphicum var. waikitense Hauck
• Rhizoclonium hookeri Kützing, 1849 accepted as Pseudorhizoclonium africanum (Kützing) Boedeker, 2016
• Rhizoclonium hosfordii Wolle, 1887
• Rhizoclonium implexum (Dillwyn) Kützing, 1845 accepted as Rhizoclonium riparium (Roth) Harvey, 1849
• Rhizoclonium interruptum Kützing, 1845 accepted as Chaetomorpha ligustica (Kützing) Kützing, 1849
• Rhizoclonium juergensii (Mertens) Kützing, 1843 accepted as Chaetomorpha ligustica (Kützing) Kützing, 1849
• Rhizoclonium kerneri Stockmayer, 1890 accepted as Rhizoclonium riparium (Roth) Harvey, 1849
• Rhizoclonium kerneri f. endozooticum Wille, 1910 accepted as Microspora ficulinae P.J.L.Dangeard, 1932
• Rhizoclonium kochianum Kützing, 1845 accepted as Rhizoclonium riparium var. implexum (Dillwyn) Rosenvinge, 1893 accepted as Rhizoclonium implexum (Dillwyn) Kützing, 1845 accepted as Rhizoclonium riparium (Roth) Harvey, 1849
• Rhizoclonium kochianum var. arenicola (Berkeley) Lily Newton, 1931 accepted as Chaetomorpha ligustica (Kützing) Kützing, 1849
• Rhizoclonium kochianum var. kerneri (Stockmayer) G.Hamel accepted as Rhizoclonium riparium var. implexum (Dillwyn) Rosenvinge, 1893 accepted as Rhizoclonium implexum (Dillwyn) Kützing, 1845 accepted as Rhizoclonium riparium (Roth) Harvey, 1849
• Rhizoclonium lacustre Kützing, 1849 accepted as Chaetomorpha ligustica (Kützing) Kützing, 1849
• Rhizoclonium lacustre f. americana Wille, 1899 (uncertain)
• Rhizoclonium lapponicum Brand (uncertain)
• Rhizoclonium linum (O.F.Müller) Thuret ex Bornet, 1892 accepted as Chaetomorpha linum (O.F.Müller) Kützing, 1845
• Rhizoclonium lubricum Setchell & N.L.Gardner, 1919 accepted as Chaetomorpha ligustica (Kützing) Kützing, 1849
• Rhizoclonium minutissimum (Zeller) P.C.Silva, 1996 accepted as Pseudorhizoclonium minutissimum (Zeller) Boedeker, Leliaert & A.R.Sherwood, 2019
• Rhizoclonium murale (Dillwyn) Kützing, 1843 accepted as Rosenvingiella radicans (Kützing) Rindi, L.McIvor & Guiry, 2004
• Rhizoclonium pachyderma
• Rhizoclonium pachyderma subsp. maclovianum Carlson, 1913 accepted as Cladophora incompta (Hooker f. & Harvey) Hooker f. & Harvey, 1847 accepted as Rama incompta (Hooker f. & Harvey) Boedeker, M.J.Wynne & Zuccarello, 2023
• Rhizoclonium pachydermum Kjellman, 1877
• Rhizoclonium panniosum Kützing accepted as Rhizoclonium riparium (Roth) Harvey, 1849
• Rhizoclonium polyrhizum Rosenvinge accepted as
• Rhizoclonium profundum Brand
• Rhizoclonium ramosum Z.Zhao & G.Liu, 2016
• Rhizoclonium rhizophilum W.R.Taylor, 1945 accepted as Pseudorhizoclonium rhizophilum (W.R.Taylor) Boedeker, 2016
• Rhizoclonium riparium (Roth) Harvey, 1849
• Rhizoclonium riparium f. casparyi (Harvey) Holmes & Batters, 1890 accepted as Chaetomorpha ligustica (Kützing) Kützing, 1849
• Rhizoclonium riparium f. validum Foslie, 1884 accepted as Rhizoclonium riparium var. validum (Foslie) De Toni, 1889
• Rhizoclonium riparium var. implexum (Dillwyn) Rosenvinge, 1893 accepted as Rhizoclonium implexum (Dillwyn) Kützing, 1845 accepted as Rhizoclonium riparium (Roth) Harvey, 1849
• Rhizoclonium riparium var. kochianum (Kützing) accepted as Chaetomorpha ligustica (Kützing) Kützing, 1849
• Rhizoclonium riparium var. tortuosum Kutzing
• Rhizoclonium riparium var. validum (Foslie) De Toni, 1889
• Rhizoclonium rivulare (Kützing) Kützing, 1849 accepted as Cladophora rivularis (Linnaeus) Kuntze, 1891
• Rhizoclonium robustum Setchell & N.L.Gardner, 1937
• Rhizoclonium salinum Kützing accepted as Rhizoclonium riparium (Roth) Harvey, 1849
• Rhizoclonium samoense Setchell, 1924 accepted as Pseudorhizoclonium africanum (Kützing) Boedeker, 2016
• Rhizoclonium sandvicense (C.Agardh) Wille
• Rhizoclonium setaceum Kützing, 1847
• Rhizoclonium subtile Z.Zhao & G.Liu, 2018
• Rhizoclonium tenue Kützing
• Rhizoclonium tortuosum (Dillwyn) Kützing, 1845
• Rhizoclonium tortuosum f. longiarticulatum F.S.Collins, 1911 (uncertain)
• Rhizoclonium tortuosum f. polyrhiza Holden, 1899 (uncertain)
• Rhizoclonium umbraticum Ichihara & Miyaji, 2016 accepted as Pseudorhizoclonium umbraticum (Ichihara & Miyaji) Boedeker, Leliaert & A.R.Sherwood, 2019
• Rhizoclonium zelleri De Toni, 1889 accepted as Pseudorhizoclonium minutissimum (Zeller) Boedeker, Leliaert & A.R.Sherwood, 2019