Basidium

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.Kent H. McKnight; Roger Tory Peterson; Vera B. McKnight, A Field Guide to Mushrooms: North America (Boston: Houghton Mifflin, 1987), pp. 16–17

 References 

Category:Fungi