| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Xanthomendoza trachyphylla | 0 | 0 | 1 |
| Xanthoria | 4 | 0 | 0 |
| Xanthoria candelaria (L.) Th. Fr. | 0 | 0 | 1 |
| Xanthoria elegans (Link) Th. Fr. | 0 | 0 | 1 |
| Xanthoria fallax | 0 | 0 | 1 |
| Xanthoria ulophyllodes | 0 | 0 | 1 |
| Xanthorrhoeaceae | 1 | 0 | 0 |
| Xenoceltitidae | 1 | 0 | 0 |
| Xenochrophis Günther 1864 | 1 | 0 | 0 |
| Xenochrophis piscator (Schneider 1799) | 0 | 0 | 1 |
| Xenodiscoides | 1 | 0 | 0 |
| Xenodiscoides falcatus (Waagen 1895) | 0 | 0 | 0 |
| Xeropicta Monterosato 1892 | 1 | 0 | 0 |
| Xeropicta krynickii (Andrzejowski ex Krynicki 1833) | 0 | 0 | 1 |
| Xylanthemum | 3 | 0 | 0 |
