• Acrosiphonia coalita (Ruprecht) Scagel, Garbary, Golden & M.W.Hawkes, 1986: unknown
• Acrosiphonia congregata (Agardh) Kjellman: unknown
• Acrosiphonia duriuscula (Ruprecht) Yendo, 1916: unknown
• Acrosiphonia effusa Kjellman, 1893: unknown
• Acrosiphonia flabelliformis Jónsson: unknown
• Acrosiphonia flaccida Kjellman: unknown
• Acrosiphonia flagellata Kjellman, 1893: unknown
• Acrosiphonia grandis Kjelmann, 1893: unknown
• Acrosiphonia hemisphaerica Kjellman, 1893: unknown
• Acrosiphonia heterocladia (Sakai) K.L.Vinogradova, 1979: unknown
• Acrosiphonia incurva Kjellman, 1893: unknown
• Acrosiphonia minima (Fosl.) Kjellman: unknown
• Acrosiphonia orientalis (J.Agardh) P.C.Silva, 1996: unknown
• Acrosiphonia penicilliformis (Foslie) Kjellman, 1893: unknown
• Acrosiphonia saxatilis (Ruprecht) K.L.Vinogradova, 1979: unknown
• Acrosiphonia setacea Kjellman: unknown
• Acrosiphonia sonderi (Kützing) Kornmann, 1962: unknown
• Acrosiphonia spinescens (Kützing) Kjellman, 1893: unknown
• Acrosiphonia stolonifera Kjellman, 1893: unknown
• Chaetomorpha adrianii Feldmann, 1936: unknown
• Chaetomorpha akineta M.A.Sahito, Z.A.Nizamani & S.M.Leghari: unknown
• Chaetomorpha antennina (Bory) Kützing, 1847: unknown
• Chaetomorpha auricoma (Suhr) Blair, 1983: unknown
• Chaetomorpha baicalensis K.I.Meyer [C.I.Meyer], 1922: unknown
• Chaetomorpha bangioides E.Y.Dawson, 1950: unknown
• Chaetomorpha basiretrorsa Setchell, 1926: unknown
• Chaetomorpha billardieri Kützing, 1847: unknown
• Chaetomorpha brachygona Harvey, 1858: unknown
• Chaetomorpha breviarticulata Hauck, 1884: unknown
• Chaetomorpha californica Collins, 1900: unknown
• Chaetomorpha cannabina (Areschoug) Kjellman, 1889: unknown
• Chaetomorpha capillaris (Kützing) Børgesen, 1925: unknown
• Chaetomorpha cartilaginea M.Howe, 1914: unknown
• Chaetomorpha chapmanii Molinari & Guiry, 2021: unknown
• Chaetomorpha clavata Kützing, 1847: unknown
• Chaetomorpha coliformis (Montagne) Kützing, 1849: unknown
• Chaetomorpha crassa (C.Agardh) Kützing, 1845: unknown
• Chaetomorpha curta (Skab.) Skabitschevsky, 1970: unknown
• Chaetomorpha dalmatica (Kuutzing) Kützing, 1845: unknown
• Chaetomorpha dubyana Kützing, 1853: unknown
• Chaetomorpha elongata V.J.Chapman, 1956: unknown
• Chaetomorpha exigua Schiffner, 1931: unknown
• Chaetomorpha exilissima E.R.Parodi & E.J.Cáceres, 1996: unknown
• Chaetomorpha exposita (Børgesen) E.Y.Dawson, 1954: unknown
• Chaetomorpha firma Levring, 1941: unknown
• Chaetomorpha geniculata Montagne, 1856: unknown
• Chaetomorpha gracilis Kützing, 1845: unknown
• Chaetomorpha henningsii P.G.Richter, 1893: unknown
• Chaetomorpha herbipolensis Lagerheim, 1887: unknown
• Chaetomorpha implicata Kützing, 1847: unknown
• Chaetomorpha indica (Kützing) Kützing, 1849: unknown
• Chaetomorpha inflata Kützing, 1849: unknown
• Chaetomorpha intestinalis Kützing, 1849: unknown
• Chaetomorpha irregularis (Zaneveld) M.Cormaci, G.Furnari & G.Alongi, 2014: unknown
• Chaetomorpha javanica Kützing, 1847: unknown
• Chaetomorpha kellersii M.A.Howe, 1932: unknown
• Chaetomorpha kerguelensis Levring, 1944: unknown
• Chaetomorpha liaodongensis L.Luan & R.Ding, 2013: unknown
• Chaetomorpha ligustica (Kützing) Kützing, 1849: unknown
• Chaetomorpha linoides Kützing, 1847: unknown
• Chaetomorpha linum (O.F.Müller) Kützing, 1845: unknown
• Chaetomorpha litorea Harvey, 1858: unknown
• Chaetomorpha longiarticulata Harvey, 1858: unknown
• Chaetomorpha macrotona Suringar, 1867: unknown
• Chaetomorpha mauritiana Kutz.: unknown
• Chaetomorpha mawsonii A.H.S.Lucas, 1919: unknown
• Chaetomorpha mediterranea (Kützing) Kützing, 1849: unknown
• Chaetomorpha melagonium (F.Weber & D.Mohr) Kützing, 1845: unknown
• Chaetomorpha minima Collins & Hervey, 1917: unknown
• Chaetomorpha moniliformis Skabitschevsky, 1936: unknown
• Chaetomorpha moniligera Kjellman, 1897: unknown
• Chaetomorpha monilina (Zanardini) Zanardini: unknown
• Chaetomorpha natalensis (Hering) De Toni, 1889: unknown
• Chaetomorpha nodosa Kützing, 1849: unknown
• Chaetomorpha norvegica Leliaert & Rueness, 2009: unknown
• Chaetomorpha obscura Kjellman, 1880: unknown
• Chaetomorpha ochlophobians Kraft, 2007: unknown
• Chaetomorpha olneyi Harvey, 1858: unknown
• Chaetomorpha pachynema (Montagne) Kützing, 1847: unknown
• Chaetomorpha pacifica Kützing, 1849: unknown
• Chaetomorpha pallida V.J.Chapman, 1956: unknown
• Chaetomorpha pallida Zanardini ex Fraunfeld, 1855: unknown
• Chaetomorpha patentiramea (Mont) Kutz.: unknown
• Chaetomorpha philippinensis Leliaert, 2011: unknown
• Chaetomorpha picquotiana Montagne ex Kützing, 1849: unknown
• Chaetomorpha recurva Scagel, 1966: unknown
• Chaetomorpha restricta (Suhr) Kützing, 1853: unknown
• Chaetomorpha robusta (Areschoug) Papenfuss, 1940: unknown
• Chaetomorpha saccata (Kützing) Kützing, 1849: unknown
• Chaetomorpha septentrionalis Foslie, 1881: unknown
• Chaetomorpha setacea (Agardh) Kützing, 1845: unknown
• Chaetomorpha solitaria Scabichevsky, 1931: unknown
• Chaetomorpha spiralis Okamura, 1903: unknown
• Chaetomorpha stricta Schiffner: unknown
• Chaetomorpha stuhlmannii Hieronymus, 1895: unknown
• Chaetomorpha tenuissima P.Crouan & H.Crouan, 1865: unknown
• Chaetomorpha tokyoensis Ichihara & Miyaji, 2013: unknown
• Chaetomorpha tortuosa (Dillwyn) Kleen, 1874: unknown
• Chaetomorpha valida (J.D.Hooker & Harvey) Kützing, 1849: unknown
• Chaetomorpha vieillardii (Kützing) M.J.Wynne, 2011: unknown