A basidium (plural basidia) is a microscopic type of spore-producing cell found on certain fungi. Most often the basidia are elongated and club shaped. But there is variation in the shape. A basidium usually bears four sexual spores called basidiospores.
- Heino Lepp. "Classifying fungi into ascomycetes and basidiomycetes". Australian National Botanic Gardens and Australian National Herbarium, Canberra. Retrieved 2 January 2016.
- Kent H. McKnight; Roger Tory Peterson; Vera B. McKnight, A Field Guide to Mushrooms: North America (Boston: Houghton Mifflin, 1987), pp. 16–17