| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Anthosachne | 2 | 0 | 0 |
| Anthosachne multiflorus | 0 | 0 | 1 |
| Anthosachne scaber | 0 | 0 | 1 |
| Anthracothecium (anthracothecium lichen) | 2 | 0 | 0 |
| Anthracothecium australiense | 0 | 0 | 1 |
| Anthracothecium neoculata | 0 | 0 | 1 |
| Antisabia Wenz 1940 | 1 | 0 | 0 |
| Antisabia foliacea (Quoy & Gaimard 1835) | 0 | 0 | 1 |
| Aora Krøyer 1845 | 1 | 0 | 0 |
| Aora spinimerus (Ledoyer 1984) | 0 | 0 | 1 |
| Aoridae Stebbing 1899 | 2 | 0 | 0 |
| Apiaceae (umbellifers) | 7 | 0 | 0 |
| Apiales | 4 | 0 | 0 |
| Aplodactylidae (marblefishes) | 1 | 0 | 0 |
| Aplodactylus | 1 | 0 | 0 |
