| Acrostichum squamosum Sw., 1801 |
| Acrostichum squarrosum Klotzsch, 1847 |
| Acrostichum tambillense Hook., 1844 |
| Acrostichum tartareum Cav., 1802 |
| Acrostichum tectum Humb. & Bonpl. ex Willd., 1810 |
| Acrostichum tenuiculum Fée, 1865 |
| Acrostichum tenuifolium Liebm., 1849 |
| Acrostichum thalictroides L., 1753 |
| Acrostichum trifoliatum L., 1753 |
| Acrostichum umbrosum Liebm., 1849 |
| Acrostichum venustum Liebm., 1849 |
| Acrostichum vestitum Schltdl. & Cham., 1830 |
| Acrostichum viride E. Fourn., 1872 |
| Adiantopsis Fée, 1852 |
| Adiantopsis chlorophylla (Sw.) Fée, 1852 |
| Adiantopsis radiata (L.) Fée, 1852 |
| Adiantopsis seemannii (Hook.) Maxon, 1939 |
| Adiantum L., 1753 |
| Adiantum alan-smithii R.Y. Hirai, Sundue & J. Prado, 2014 |
| Adiantum aleuticum (Rupr.) C.A. Paris, 1991 |