| Adiantum amabile Liebm., 1849 |
| Adiantum amblyopteridium Mickel & Beitel, 1988 |
| Adiantum amplum C. Presl, 1825 |
| Adiantum andicola Liebm., 1849 |
| Adiantum aquismonense Guzmán-Cornejo & Pacheco, 2024 |
| Adiantum asperum (Poir.) Desv., 1811 |
| Adiantum braunii Mett. ex Kuhn, 1869 |
| Adiantum braunii var. cuneatum Mett. ex Kuhn, 1869 |
| Adiantum capillus-veneris L., 1753 |
| Adiantum capillus-veneris var. protrusum Fernald, 1950 |
| Adiantum caryotideum Christ, 1909 |
| Adiantum chilense Kaulf., 1824 |
| Adiantum chilense var. pilosulum Liebm., 1849 |
| Adiantum clavatum L., 1753 |
| Adiantum concinnum Humb. & Bonpl. ex Willd., 1810 |
| Adiantum concinnum M. Martens & Galeotti, 1842 |
| Adiantum convolutum E. Fourn., 1872 |
| Adiantum cooperi Baker, 1887 |
| Adiantum cordifolium Sessé & Moc., 1890 |
| Adiantum crenatum Poir., 1810 |