Reproductive cells formed on mushroom gills are called basidiospores.

Here's why:

* Basidia: These are club-shaped cells found on the gills of mushrooms.

* Basidiospores: These are the spores produced by basidia through a process called meiosis. They are the reproductive cells of the mushroom and are responsible for spreading and colonizing new areas.

Let me know if you have any more questions about mushrooms! 🍄