• Acanthophora aokii Okamura, 1934: non-unicellular
• Acanthophora dendroides Harvey, 1855: non-unicellular
• Acanthophora muscoides (Linnaeus) Bory de Saint-Vincent, 1828: non-unicellular
• Acanthophora nayadiformis (Delile) Papenfuss, 1968: non-unicellular
• Acanthophora pacifica (Setchell) Kraft, 1979: non-unicellular
• Acanthophora ramulosa Lindenberg ex Kützing, 1843: non-unicellular
• Acanthophora spicifera (M.Vahl) Børgesen, 1910: non-unicellular
• Acanthosphaera zachariasii Lemmermann, 1899: non-unicellular
• Acinetospora asiatica Yaegashi, Yamagishi & Kogame, 2015: non-unicellular
• Acinetospora crinita (Carmichael) Sauvageau, 1899: non-unicellular
• Acinetospora filamentosa (Noda) Yaegashi, Uwai & Kogame, 2015: non-unicellular
• Acinetospora nicholsoniae Hollenberg, 1971: non-unicellular
• Acrochaetium actinocladum I.A.Abbott, 1962: non-unicellular
• Acrochaetium affine M.A.Howe & Hoyt, 1916: non-unicellular
• Acrochaetium agardhiellae A.B.Joly & Cordeiro, 1963: non-unicellular
• Acrochaetium alariae (Jónsson) Bornet, 1904: non-unicellular
• Acrochaetium alcyonidiae C.C.Jao: non-unicellular
• Acrochaetium angustum (K.M.Drew) Papenfuss, 1945: non-unicellular
• Acrochaetium antillarum W.R.Taylor, 1942: non-unicellular
• Acrochaetium arcuatum (K.M.Drew) C.K.Tseng, 1945: non-unicellular
• Acrochaetium armoricanum Feldmann, 1954: non-unicellular
• Acrochaetium armoricum Feldmann, 1954: non-unicellular
• Acrochaetium arnoldii Weber-van Bosse, 1921: non-unicellular
• Acrochaetium avrainvilleae Børgesen, 1915: non-unicellular
• Acrochaetium bahreinii Børgesen, 1939: non-unicellular
• Acrochaetium balliae (Stegenga) Stegenga, Bolton & R.J.Anderson, 1997: non-unicellular
• Acrochaetium balticum (Rosenvinge) Aleem & Schulz, 1952: non-unicellular
• Acrochaetium barbadense (Vickers) Børgesen, 1915: non-unicellular
• Acrochaetium barbadensis (Vickers) Borgesen, 1915: non-unicellular
• Acrochaetium battersianum Hamel, 1927: non-unicellular
• Acrochaetium bengalicum A.K.Islam & A.Aziz, 1987: non-unicellular
• Acrochaetium blomquistii Aziz, 1965: non-unicellular
• Acrochaetium boergesenii Schiffner, 1931: non-unicellular
• Acrochaetium brebneri (Batters) Hamel, 1928: non-unicellular
• Acrochaetium bulbosa G.Hamel, 1927: non-unicellular
• Acrochaetium bulbosum Hamel: non-unicellular
• Acrochaetium byssaceum (Kützing) Nägeli, 1862: non-unicellular
• Acrochaetium caesareae Feldmann, 1931: non-unicellular
• Acrochaetium caespitiforme Børgesen, 1920: non-unicellular
• Acrochaetium callopodum (Rosenvinge) Hamel: non-unicellular
• Acrochaetium canariense Børgesen, 1927: non-unicellular
• Acrochaetium candelabrum Børgesen, 1942: non-unicellular
• Acrochaetium carneum J.Agardh: non-unicellular
• Acrochaetium catenulatum M.Howe, 1914: non-unicellular
• Acrochaetium chaetomorphae (Tanaka & P.H.Hô) Heerebout, 1968: non-unicellular
• Acrochaetium champiae P.Anand, 1943: non-unicellular
• Acrochaetium chondriae Aziz, 1965: non-unicellular
• Acrochaetium cladestinum (Mont.) Howe: non-unicellular
• Acrochaetium clandestinum (Montagne) M.Howe, 1914: non-unicellular
• Acrochaetium colaconemoides P.H.Hô, 1969: non-unicellular
• Acrochaetium collopodum (Rosenvinge) Hamel, 1927: non-unicellular
• Acrochaetium concavum (F.Schmitz & Heydrich) Setchell & Gardner: non-unicellular
• Acrochaetium crassipes (Børgesen) Børgesen, 1915: non-unicellular
• Acrochaetium curtum Baardseth, 1941: non-unicellular
• Acrochaetium cymopoliae Børgesen, 1927: non-unicellular
• Acrochaetium cytophagum (Rosenvinge) Hamel, 1927: non-unicellular
• Acrochaetium delisea Aziz, 1965: non-unicellular
• Acrochaetium discoideum Børgesen, 1924: non-unicellular
• Acrochaetium distichosporum E.Y.Dawson, Acleto & Foldvik, 1964: non-unicellular
• Acrochaetium dotyi I.A.Abbott, 1962: non-unicellular
• Acrochaetium doumerquei Hamel & Hamel-Joukov, 1931: non-unicellular
• Acrochaetium drewii Baardseth: non-unicellular
• Acrochaetium duboscqii Feldmann, 1935: non-unicellular
• Acrochaetium dumontiae (Rosenvinge) Hamel, 1927: non-unicellular
• Acrochaetium dwarkense Børgesen, 1932: non-unicellular
• Acrochaetium eastwoodae (Setchell & N.L.Gardner) Papenfuss, 1945: non-unicellular
• Acrochaetium effusum Levring, 1953: non-unicellular
• Acrochaetium endozoicum (Darbishire) Batters, 1902: non-unicellular
• Acrochaetium entophyticum Batters, 1902: non-unicellular
• Acrochaetium epispiculum A.B.Joly & Cordeiro, 1963: non-unicellular
• Acrochaetium epizooicum A.A.Aleem, 1980: non-unicellular
• Acrochaetium erectum Børgesen, 1932: non-unicellular
• Acrochaetium ernothrix Børgesen, 1915: non-unicellular
• Acrochaetium extensum Ercegovic, 1957: non-unicellular
• Acrochaetium fernandezianum (Levring) Papenfuss, 1947: non-unicellular
• Acrochaetium flexuosum Vickers, 1905: non-unicellular
• Acrochaetium fuegiense Kylin, 1919: non-unicellular
• Acrochaetium galaxaurae Aziz, 1965: non-unicellular
• Acrochaetium globosum Børgesen, 1915: non-unicellular
• Acrochaetium grande (Levring) Papenfuss, 1947: non-unicellular
• Acrochaetium grateloupiae E.Y.Dawson, 1950: non-unicellular
• Acrochaetium hamelii Feldmann, 1931: non-unicellular
• Acrochaetium hauckii Schiffner, 1916: non-unicellular
• Acrochaetium hirsutum (K.M.Drew) P.W.Gabrielson, 2000: non-unicellular
• Acrochaetium hlulekaense Stegenga, 1985: non-unicellular
• Acrochaetium homorhizum Børgesen: non-unicellular
• Acrochaetium hormorhizum Børgesen, 1915: non-unicellular
• Acrochaetium howei (Yamada) Papenfuss, 1945: non-unicellular
• Acrochaetium hoytii F.S.Collins, 1908: non-unicellular
• Acrochaetium humile (Rosenvinge) Børgesen, 1915: non-unicellular
• Acrochaetium hummii Aziz, 1965: non-unicellular
• Acrochaetium imitator I.A.Abbott, 1962: non-unicellular
• Acrochaetium immersum (Rosenvinge) Hamel, 1927: non-unicellular
• Acrochaetium inclusum (Levring) Papenfuss, 1945: non-unicellular
• Acrochaetium incrassatum Ercegovic, 1957: non-unicellular
• Acrochaetium inkyui Y.-P.Lee, 1987: non-unicellular
• Acrochaetium interpositum (Heydrich) Børgesen, 1915: non-unicellular
• Acrochaetium irregulare (Reinsch): non-unicellular
• Acrochaetium islamii Aziz, 1965: non-unicellular
• Acrochaetium iyengarii Børgesen, 1933: non-unicellular