Light micrograph of a transverse section through wheat stem showing uredosori of wheat rust (Puccinia graminis). These sori appear as rust-coloured streaks on the wheat. The released uredospores will infect other wheat plants.
B0004474 TTS wheat rust uredosori. Wellcome Images available under the following creative commons usage http://creativecommons.org/licenses/by-nc-nd/2.0/uk/