Sa
- Sangirellum A.K.Mahato & P.Mahato, 1994
- Sarcinochlamys S.Watanabe, 2006
- Sarfatiella M.A.Conrad & B.Peybernès, 1974
- Saturnella Mattauch & Pascher, 1936
Sc
- Scenedesmaceae Oltmanns, 1904
- Scenedesmoidea
- Scenedesmus Meyen, 1829
Scherffelia Pascher, 1911
- Scherffelia bichlora (H.Ettl & O.Ettl) Massjuk & Lilitsk, 2006
- Scherffelia deformis Skuja, 1939
- Scherffelia dubia (Perty) Pascher, 1912
- Scherffelia incisa (Nygaard) Massjuk & Lilitsk, 2006
- Scherffelia pelagica Skuja
- Scherffelia phacus Pascher, 1912
Plantae → Chlorophyta → Prasinophyceae → Chlorodendrales → Chlorodendraceae
- Schilleriomonas T.V.Desikachary
- Schizacanthum P.M.Lundell
- Schizochlamys Braun ex Kützing, 1849
- Schizochloris I.Kostikov, T.Darienko, A.Lukesová & L.Hoffmann
- Schizogonium Kützing, 1843
- Schizomeridaceae
- Schizomeris Kützing, 1843
- Schmidledesmus P.C. Silva, 1970
- Schmidleia J. Woloszynska, 1914
- Schroederia Lemmermann, 1898
- Schroederiella Woloszynska, 1914
- Schulziella Teiling, 1942
- Sclerococcus P.K.Maithy & O.N.Bhargava, 1982
- Scotiellocystoidaceae
- Scotiellopsis Vinatzer, 1975
- Scotinosphaera Klebs, 1881
- Scotlandella O.Dragastan, 1985
Scourfieldia G.S.West, 1912
- Scourfieldia caeca (Korschikov) J.H.Belcher & Swale, 1963
- Scourfieldia chlorolateralis A.G.Caljon, 2005
- Scourfieldia complanata G.S.West, 1912 tipična vrsta
- Scourfieldia conica Schiller, 1954
- Scourfieldia cordiformis H.Takeda, 1916
- courfieldia ovata Kufferath, 1956
- Scourfieldia quadrata Pascher, 1927
Chlorophyta → Pedinophyceae → Scourfieldiales → Scourfieldiaceae
- Scourfieldiaceae Ø. Moestrup
- Scourfieldiales
Se
- Selenastraceae
- Selenastrum Reinsch, 1867
- Selenochloris Pascher, 1927
- Selenoderma K.Bohlin, 1897
- Selenodictyon G.Uherkovich & A.Schmidt ex A.Comas & J.Komárek, 1992
- Selenosphaerium Cohn, 1879
- Seletonella K.B.Korde, 1950
- Sestosoma Hortobagyi, 1947
Si
- Siderocelis (Naumann) Fott, 1934
- Siderocystopsis Swale, 1964
- Silvamonas Skvortzov, 1967
- Silvanella O.Dragastan
- Sinamonas Skvortzov, 1968
- Sinochara Lin & Z.Wang, 1982
- Siphonocladaceae Schmitz, 1879
- Siphonocladales
- Siphonocladus F.Schmitz, 1879
- Siphonogramen I.A.Abbott & Huisman, 2004
Sk
- Skujaster D.G.Vodenicarov, 1989
- Skvortzoviothrix Bourrelly, 1973
Sm
- Smithsoniella J.R.Sears & S.H.Brawley, 1982
- Smithsonimonas Kol, 1942
So
- Songliaochara
- Sorastrum Kützing, 1845
- Soropediastrum Wille, 1924
Sp
- Spermatozopsis Korshikov, 1913
- Sphaeocystis
- Sphaerella S.C.Sommerfelt
- Sphaerellocystis Ettl, 1960
- Sphaerobotrys Butcher, 1932
- Sphaerocarpus Hassall, 1843
- Sphaerococcomyxa I.Kostikov, T.Darienko, A.Lukesová & L.Hoffmann
- Sphaerocystidaceae
- Sphaerocystis R.Chodat, 1897
- Sphaerodesmus Corda
- Sphaerodictyaceae
- Sphaeroneocystis I.Kostikov, T.Darienko, A.Lukesová & L.Hoffmann
- Sphaeroplea C.Agardh, 1824
- Sphaeropleaceae
- Sphaeropleales
- Sphaeropleales incertae sedis
- Sphaerosiphon Schussnig, 1915
- Sphenochloris Pascher, 1922
- Spirogonium Pascher, 1927
- Spondylomoraceae Korshikov, 1923
- Spondylomorum Ehrenberg, 1848
- Spongiochloris Starr, 1955
- Spongiochrysis Rindi, J.López-Bautista, A.R.Sherwood & Guiry, 2006
- Spongiococcum Deason, 1959
- Spongocladia Areschoug, 1854
- Spongodium
- Spongodium J.V.F.Lamouroux, 1813
- Spongomorpha Kützing, 1843
- Sporangites
- Sporocladopsis Nasr, 1944
- Sporocladus Kuckuck, 1897
- Sporotetras Butcher, 1932
St
- Stauridium Corda, 1839
- Stauroceras Kützing ex Kützing, 1849
- Staurophanum Turner, 1892
- Staurospermum Kützing, 1843
- Steinedesmus Kofoid, 1911
- Stellatochara H.Horn af Rantzien, 1954
- Stephanocoelium
- Stephanocoelium Kützing, 1847
- Stephanoon Schewiakoff, 1892
Stephanoptera P.-A.Dangeard, 1910
- Stephanoptera fabreae P.-A.Dangeard, 1910
- Stephanoptera gracilis (Artari) G.M.Smith, 1933
Chlorophyta → Prasinophyceae → Pyramimonadales → Polyblepharidaceae
- Stephanosphaera Cohn, 1852
- Stichococcus Nägeli, 1849
- Stigeoclonium Kützing, 1843
- Stomatochroon Palm, 1934
- Stomochara L.Grambast, 1961
- Streptochlora J.B.Petersen & J.B.Hansen, 1960
- Stromatella Kornmann & Sahling, 1985
- Struvea Sonder, 1845
- Struveopsis Rhyne & H.Robinson, 1968
- Stylosphaeridiella M.O.P.Iyengar, 1975
- Stylosphaeridium Geitler & Gimesi, 1925
Su
- Suppiluliumaella G.F.Elliott
- Suxenella P.Srivastava & M.Nizamuddin, 1939
Sw
- Swarchewskiella Yasnitskii, 1931
Sy
Sycamina Van Tieghem, 1880
- Sycamina nigrescens van Tieghem, 1880
Chlorophyta → Prasinophyceae → Pyramimonadales → Polyblepharidaceae
- Sycidion
- Sykidion E.P.Wright, 1881
- Symbiococcum M.Rahat & V.Reich, 1989
- Symbiomonas Guillou & Chrétiennot-Dinet, 1999
- Syncoryne R.Nielsen & P.M.Pedersen, 1977