| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Achelia echinata Hodge 1864 | 0 | 0 | 1 |
| Sagenista | 0 | 0 | 1 |
| Achnanthidiaceae | 1 | 0 | 0 |
| Acinetospora Bornet 1891 | 1 | 0 | 0 |
| Acinetospora crinita | 0 | 0 | 1 |
| Acinetosporaceae | 4 | 0 | 0 |
| Acnanthales | 2 | 0 | 0 |
| Acrochaete | 1 | 0 | 0 |
| Ulvella repens | 0 | 0 | 1 |
| Acrochaetiaceae | 3 | 0 | 0 |
| Acrochaetiales | 1 | 0 | 0 |
| Acrochaetium Nägeli 1858 | 4 | 0 | 0 |
| Acrochaetium efflorescens | 0 | 0 | 1 |
| Acrochaetium sparsum (Harvey) Nägeli 1862 | 0 | 0 | 1 |
| Acrochaetium trifilum | 0 | 0 | 1 |
