• Scytonema C.A. Agardh ex Bornet & Flahault, 1886
• Scytonema alatum Borzì ex Bornet & Flahault, 1886
• Scytonema ambiguum Kützing ex Bornet & Flahault, 1886 accepted as Fischerella ambigua (Kützing ex Bornet & Flahault) Gomont, 1895
• Scytonema ambiguum Kützing, 1849 accepted as Scytonema mirabile Bornet, 1889
• Scytonema amplum W. West & G.S. West, 1895
• Scytonema andradeana P. González, 1950
• Scytonema arcangelii Bornet & Flahault, 1886
• Scytonema arenarium Berkeley, 1839 accepted as Schizothrix arenaria Gomont, 1892
• Scytonema austinii Wood, 1874
• Scytonema azureum Tilden, 1909
• Scytonema badium Wolle, 1877
• Scytonema bewsii F.E. Fritsch
• Scytonema bivaginatum Welsh
• Scytonema bohneri Schmidle, 1901
• Scytonema bohnerii Schmidle
• Scytonema bruneum Schmidle
• Scytonema brunneum Schmidle, 1902
• Scytonema burmanicum Skuja, 1948
• Scytonema byssoideum C. Agardh, 1812 accepted as Tolypothrix byssoidea (C. Agardh) Kirchner, 1898
• Scytonema calcicola Kufferath, 1915
• Scytonema caldarium Setchell, 1829
• Scytonema calothrichoides Kützing
• Scytonema capitatum N.L. Gardner, 1927
• Scytonema catenatum N.L. Gardner, 1927
• Scytonema chengii Wang, 1934
• Scytonema chiastum Geitler, 1925
• Scytonema cincinnatum (Kützing) Thuret, 1875 accepted as Scytonema crispum (C. Agardh) Bornet, 1889
• Scytonema cineraceum C.L. Zhou & H.X. Xiao
• Scytonema cinereum Meneghini, 1837 accepted as Scytonema ocellatum Bornet & Flahault, 1886
• Scytonema coactile Bornet & Flahault, 1886
• Scytonema coactile Montagne, 1849
• Scytonema compactum C. Agardh, 1812 accepted as Calothrix compacta Margalef, 1953
• Scytonema conchophilum Humphrey, 1901
• Scytonema consociatum C.-C. Jao, 1944
• Scytonema cookei W. West & G.S. West, 1892
• Scytonema crassum Nägeli, 1849
• Scytonema crispum (C. Agardh) Bornet, 1889
• Scytonema crustaceum C. Agardh ex Bornet & Flahault, 1886
• Scytonema crustaceum C. Agardh, 1824 accepted as Scytonema crustaceum C. Agardh ex Bornet & Flahault, 1886
• Scytonema cuatrecasasii P. González, 1930
• Scytonema curvatum (Meneghini) Borzì, 1879 accepted as Lyngbya curvata (Meneghini) Rabenhorst ex Gomont, 1892
• Scytonema densum (A. Braun) Bornet & Flahault, 1880 accepted as Petalonema densum (A. Braun) Migula, 1907
• Scytonema dilatatum Bharadwaja, 1934
• Scytonema drilosiphon Elenkin & V. Polyanski, 1922
• Scytonema dubium De Wildeman, 1897
• Scytonema endolithicum Ercegovic, 1932
• Scytonema evanescens Gardner, 1927
• Scytonema figuratum C. Agardh, 1824 accepted as Scytonema mirabile Bornet, 1889
• Scytonema flavoviride Bornet & Flahault
• Scytonema flexuosum Meneghini
• Scytonema foliicola DeWildeman
• Scytonema foliicolum De Wildeman, 1897
• Scytonema fremyi Desikachary, 1959
• Scytonema friesii (C. Agardh) Montagne & Fries, 1836 accepted as Symplocastrum friesii (Gomont ex Gomont) Kirchner, 1898
• Scytonema fritschii S.L. Ghose, 1923
• Scytonema fuliginosum Tilden, 1909 accepted as Tildenia fuliginosa (Tilden) Kossinskaja, 1926
• Scytonema gaudichaudianum Montagne, 1849 accepted as Lyngbya mauretanica Montagne ex Gomont, 1892
• Scytonema geitleri Bharadwaja, 1934
• Scytonema gomontii Gutwinski, 1901
• Scytonema granulatum G. Martens, 1871
• Scytonema guyanense Bornet & Flahault, 1888
• Scytonema hamelinii Gebelein, 1974
• Scytonema hansgirgi Schmidle, 1900
• Scytonema hieronymi Schmidle, 1897
• Scytonema hofman-bangii C. Agardh, 1812
• Scytonema hofmanii C. Agardh, 1817 accepted as Scytonema hofman-bangii C. Agardh, 1812
• Scytonema hofmannii Bornet & Flahault, 1886
• Scytonema holstii Hieronimus, 1895
• Scytonema hormoides Kützing accepted as Stigonema hormoides (Kützing) Bornet & Flahault, 1887
• Scytonema hyalinum Gardner, 1927
• Scytonema incrassatum C.-C. Jao, 1944
• Scytonema incrustans Kützing
• Scytonema induratum Copeland
• Scytonema insigne W. West & G.S. West, 1897
• Scytonema insulare C.L. Sant'Anna
• Scytonema intermedium De Wildeman, 1897
• Scytonema interruptum (Carmich. ex Hook.) Cooke, 1882 accepted as Dictyonema interruptum (Carmich. ex Hook.) Parmasto, 1979
• Scytonema intertextum (Kützing) Rabenhorst, 1865
• Scytonema intricatum Bory de Saint-Vincent, 1828 accepted as Stictosiphonia intricata (Bory de Saint-Vincent) P.C. Silva, 1996
• Scytonema involvens
• Scytonema iyengari Bharadwaja, 1934
• Scytonema javanicum Bornet, 1880
• Scytonema julianum Meneghini, 1841
• Scytonema junipericola Farlow
• Scytonema kaernbachii Hennings, 1892 accepted as Porphyrosiphon kaernbachii (Hennings) De Toni, 1892
• Scytonema kwangsiense C.-C. Jao
• Scytonema leptobasis Ghose, 1931
• Scytonema longiarticulatum Gardner, 1927
• Scytonema lyngbyoides Gardner, 1927
• Scytonema magnum Gardner, 1927
• Scytonema malaviyaensis Bharadwaja, 1930
• Scytonema malaviyanense Bharadwaya
• Scytonema masonianum Welsh
• Scytonema millei Bornet, 1880
• Scytonema minus (Schmidle) Lemmermann
• Scytonema minutum C. Agardh, 1815 accepted as Stigonema minutum (C. Agardh) Hassall ex Bornet & Flahault, 1887
• Scytonema mirabile Bornet, 1889
• Scytonema mirabile Wolle, 1878 accepted as Scytonema wolleanum Forti, 1907
• Scytonema multiramosum Gardner, 1927
• Scytonema murale Zeller, 1873 accepted as Scytonema ocellatum Bornet & Flahault, 1886