| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Arnellia Lindb. | 0 | 0 | 2 |
| Arnellia Lindb. | 2 | 0 | 2 |
| Arnellia fennica (Gottsche & Rabenh.) Lindb. | 0 | 0 | 4 |
| Arnellia fennica (Gottsche & Rabenh.) Lindb. | 0 | 0 | 4 |
| Arnelliaceae | 1 | 0 | 0 |
| Asterella P. Beauv. | 2 | 0 | 2 |
| Asterella gracilis (F. Weber) Underw. | 0 | 0 | 2 |
| Asterella saccata (Wahlenb.) A. Evans | 0 | 0 | 2 |
| Athalamia Falc. | 1 | 0 | 2 |
| Athalamia hyalina (Sommerf.) S. Hatt. ex Shim. & S. Hatt. | 0 | 0 | 2 |
| Athalamya | 1 | 0 | 0 |
| Athalamya hyalina | 0 | 0 | 2 |
| Aulacomniaceae | 1 | 0 | 0 |
| Aulacomnium (aulacomnium moss) | 0 | 0 | 2 |
| Aytoniaceae | 3 | 0 | 0 |
