| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Acrochaetium secundatum | 0 | 0 | 1 |
| Acrochaetium seiriolanum | 0 | 0 | 1 |
| Acrochaetium sparsum (Harvey) Nägeli 1862 | 0 | 0 | 1 |
| Acrochaetium virgatulum | 0 | 0 | 1 |
| Acrocirridae | 1 | 0 | 0 |
| Acrocnida Gislén 1926 | 1 | 0 | 0 |
| Acrocnida brachiata (Montagu 1804) | 0 | 0 | 1 |
| Acrosiphonia J. Agardh 1846 | 3 | 0 | 0 |
| Acrosiphonia arcta | 0 | 0 | 1 |
| Acrosiphonia stolonifera | 0 | 0 | 1 |
| Acrosiphonia traillii | 0 | 0 | 1 |
| Acrosiphoniaceae | 2 | 0 | 0 |
| Acrosorium Zanardini ex Kützing 1869 | 2 | 0 | 0 |
| Acrosorium uncinatum (J. Agardh (1924)) | 0 | 0 | 1 |
| Acrosorium venulosum | 0 | 0 | 1 |
