BASIDOMYCOTA Description: Includes jelly and shelf, or bracket, fungi; mushrooms, puffballs, and stinkhorns. The club-shaped spore-bearing organ usually produces four sexual spores. Commercial Value: Puccinia graminis causes wheat rust. It overwinters in barberry where it produces spores in a cup-shaped aecium. In the spring and summer spores infect wheat, and spread from uredia that burst through the leaf. Examples: 1. Jelly Fungus