• Asterocladon ednae Sasagawa, Santiañez & Kogame, 2022: ephemeral
• Asterocladon interjectum Uwai, Nagasato, Motomura & Kogame, 2005: ephemeral
• Asterocladon lobatum D.G.Müller, E.R.Parodi & A.F.Peters, 1999: ephemeral
• Asterocladon rhodochortonoides (Børgesen) S.Uwai, C.Nagasato, T.Motomura & K.Kogame, 2005: ephemeral
• Atractophora hypnoides P.Crouan & H.Crouan, 1848: ephemeral
• Blidingia chadefaudii (Feldmann) Bliding, 1963: ephemeral
• Blidingia marginata (J.Agardh) P.J.L.Dangeard ex Bliding, 1963: ephemeral
• Blidingia minima (Nägeli ex Kützing) Kylin, 1947: ephemeral
• Chaetomorpha adrianii Feldmann, 1936: ephemeral
• Chaetomorpha akineta M.A.Sahito, Z.A.Nizamani & S.M.Leghari: ephemeral
• Chaetomorpha antennina (Bory) Kützing, 1847: ephemeral
• Chaetomorpha auricoma (Suhr) Blair, 1983: ephemeral
• Chaetomorpha baicalensis K.I.Meyer [C.I.Meyer], 1922: ephemeral
• Chaetomorpha bangioides E.Y.Dawson, 1950: ephemeral
• Chaetomorpha basiretrorsa Setchell, 1926: ephemeral
• Chaetomorpha billardieri Kützing, 1847: ephemeral
• Chaetomorpha brachygona Harvey, 1858: ephemeral
• Chaetomorpha breviarticulata Hauck, 1884: ephemeral
• Chaetomorpha californica Collins, 1900: ephemeral
• Chaetomorpha cannabina (Areschoug) Kjellman, 1889: ephemeral
• Chaetomorpha capillaris (Kützing) Børgesen, 1925: ephemeral
• Chaetomorpha cartilaginea M.Howe, 1914: ephemeral
• Chaetomorpha chapmanii Molinari & Guiry, 2021: ephemeral
• Chaetomorpha clavata Kützing, 1847: ephemeral
• Chaetomorpha coliformis (Montagne) Kützing, 1849: ephemeral
• Chaetomorpha crassa (C.Agardh) Kützing, 1845: ephemeral
• Chaetomorpha curta (Skab.) Skabitschevsky, 1970: ephemeral
• Chaetomorpha dalmatica (Kuutzing) Kützing, 1845: ephemeral
• Chaetomorpha dubyana Kützing, 1853: ephemeral
• Chaetomorpha elongata V.J.Chapman, 1956: ephemeral
• Chaetomorpha exigua Schiffner, 1931: ephemeral
• Chaetomorpha exilissima E.R.Parodi & E.J.Cáceres, 1996: ephemeral
• Chaetomorpha exposita (Børgesen) E.Y.Dawson, 1954: ephemeral
• Chaetomorpha firma Levring, 1941: ephemeral
• Chaetomorpha geniculata Montagne, 1856: ephemeral
• Chaetomorpha gracilis Kützing, 1845: ephemeral
• Chaetomorpha henningsii P.G.Richter, 1893: ephemeral
• Chaetomorpha herbipolensis Lagerheim, 1887: ephemeral
• Chaetomorpha implicata Kützing, 1847: ephemeral
• Chaetomorpha indica (Kützing) Kützing, 1849: ephemeral
• Chaetomorpha inflata Kützing, 1849: ephemeral
• Chaetomorpha intestinalis Kützing, 1849: ephemeral
• Chaetomorpha irregularis (Zaneveld) M.Cormaci, G.Furnari & G.Alongi, 2014: ephemeral
• Chaetomorpha javanica Kützing, 1847: ephemeral
• Chaetomorpha kellersii M.A.Howe, 1932: ephemeral
• Chaetomorpha kerguelensis Levring, 1944: ephemeral
• Chaetomorpha liaodongensis L.Luan & R.Ding, 2013: ephemeral
• Chaetomorpha ligustica (Kützing) Kützing, 1849: ephemeral
• Chaetomorpha linoides Kützing, 1847: ephemeral
• Chaetomorpha linum (O.F.Müller) Kützing, 1845: ephemeral
• Chaetomorpha litorea Harvey, 1858: ephemeral
• Chaetomorpha longiarticulata Harvey, 1858: ephemeral
• Chaetomorpha macrotona Suringar, 1867: ephemeral
• Chaetomorpha mauritiana Kutz.: ephemeral
• Chaetomorpha mawsonii A.H.S.Lucas, 1919: ephemeral
• Chaetomorpha mediterranea (Kützing) Kützing, 1849: ephemeral
• Chaetomorpha minima Collins & Hervey, 1917: ephemeral
• Chaetomorpha moniliformis Skabitschevsky, 1936: ephemeral
• Chaetomorpha moniligera Kjellman, 1897: ephemeral
• Chaetomorpha monilina (Zanardini) Zanardini: ephemeral
• Chaetomorpha natalensis (Hering) De Toni, 1889: ephemeral
• Chaetomorpha nodosa Kützing, 1849: ephemeral
• Chaetomorpha norvegica Leliaert & Rueness, 2009: ephemeral
• Chaetomorpha obscura Kjellman, 1880: ephemeral
• Chaetomorpha ochlophobians Kraft, 2007: ephemeral
• Chaetomorpha olneyi Harvey, 1858: ephemeral
• Chaetomorpha pachynema (Montagne) Kützing, 1847: ephemeral
• Chaetomorpha pacifica Kützing, 1849: ephemeral
• Chaetomorpha pallida V.J.Chapman, 1956: ephemeral
• Chaetomorpha pallida Zanardini ex Fraunfeld, 1855: ephemeral
• Chaetomorpha patentiramea (Mont) Kutz.: ephemeral
• Chaetomorpha philippinensis Leliaert, 2011: ephemeral
• Chaetomorpha picquotiana Montagne ex Kützing, 1849: ephemeral
• Chaetomorpha recurva Scagel, 1966: ephemeral
• Chaetomorpha restricta (Suhr) Kützing, 1853: ephemeral
• Chaetomorpha robusta (Areschoug) Papenfuss, 1940: ephemeral
• Chaetomorpha saccata (Kützing) Kützing, 1849: ephemeral
• Chaetomorpha septentrionalis Foslie, 1881: ephemeral
• Chaetomorpha setacea (Agardh) Kützing, 1845: ephemeral
• Chaetomorpha solitaria Scabichevsky, 1931: ephemeral
• Chaetomorpha spiralis Okamura, 1903: ephemeral
• Chaetomorpha stricta Schiffner: ephemeral
• Chaetomorpha stuhlmannii Hieronymus, 1895: ephemeral
• Chaetomorpha tenuissima P.Crouan & H.Crouan, 1865: ephemeral
• Chaetomorpha tokyoensis Ichihara & Miyaji, 2013: ephemeral
• Chaetomorpha tortuosa (Dillwyn) Kleen, 1874: ephemeral
• Chaetomorpha valida (J.D.Hooker & Harvey) Kützing, 1849: ephemeral
• Chaetomorpha vieillardii (Kützing) M.J.Wynne, 2011: ephemeral
• Chaetomorpha zernovii Woronichin, 1925: ephemeral
• Choristocarpus tenellus Zanardini, 1860: ephemeral
• Discosporangium mesarthrocarpum (Meneghini) Hauck, 1885: ephemeral
• Discosporangium pulvillocarpum Kraft, 2009: ephemeral
• Ectocarpus siliculosus (Dillwyn) Lyngbye, 1819: ephemeral
• Laminaria hyperborea (Gunnerus) Foslie, 1884: ephemeral
• Monostroma alittorale T.Tanaka & K.Nozawa, 1963: ephemeral
• Monostroma angicava Kjellman, 1883: ephemeral
• Monostroma antarcticum V.J.Chapman, 1956: ephemeral
• Monostroma balticum Wittrock, 1866: ephemeral
• Monostroma bullosum (Roth) Thuret, 1854: ephemeral
• Monostroma crassidermum Tokida, 1954: ephemeral