| Acanthophora J.V. Lamour., 1813 |
| Acanthophora muscoides (L.) Bory, 1828 |
| Acanthophora spicifera (Vahl) Børgesen, 1910 |
| Acanthophora thierryi J.V. Lamour., 1813 |
| Acanthosiphonia Savoie & G.W. Saunders, 2019 |
| Acanthosiphonia echinata (Harvey) A.M. Savoie & G.W. Saunders, 2019 |
| Alsidium C. Agardh, 1827 |
| Alsidium pusillum E. Y. Dawson, 1963 |
| Alsidium seaforthii (Turner) J. Agardh, 1841 |
| Alsidium tenuissimum (Gooden. & Woodward) Kütz., 1843 |
| Alsidium tenuissimum f. crassa Crouan frat., 1865 |
| Alsidium triangulare (S.G. Gmel.) J. Agardh, 1841 |
| Alsidium triquetrum (S.G. Gmelin) Trevisan, 1945 |
| Amansia J.V. Lamour., 1809 |
| Amansia multifida J.V. Lamour., 1809 |
| Amansia obtusiloba (C. Agardh) J. Agardh, 1841 |
| Amansieae Schmitz, 1889 |
| Amplisiphonia Hollenberg, 1939 |
| Amplisiphonia pacifica Hollenberg, 1939 |
| Bostrychia Mont., 1842 |