| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Agaricales (Gilled Fungi) | 1 | 0 | 0 |
| Agaricomycetes (Mushroom-Forming Fungi) | 1 | 0 | 0 |
| Agarum Dumortier 1822 | 2 | 0 | 0 |
| Agarum clathratum | 0 | 0 | 1 |
| Agarum cribrosum | 0 | 0 | 1 |
| Aglaophamus Kinberg 1866 | 1 | 0 | 0 |
| Aglaophamus circinata (Verrill ex Smith & Harger 1874) | 0 | 0 | 1 |
| Aglaothamnion Feldmann-Mazoyer 1941 | 1 | 0 | 0 |
| Aglaothamnion halliae | 0 | 0 | 1 |
| Agonidae (poachers) | 3 | 0 | 0 |
| Ahnfeltia Fries 1836 | 2 | 0 | 0 |
| Ahnfeltia borealis | 0 | 0 | 1 |
| Ahnfeltia plicata | 0 | 0 | 1 |
| Ahnfeltiaceae | 1 | 0 | 0 |
| Ahnfeltiales | 1 | 0 | 0 |
