PLANTS. Parasitic Fungi on Grain Crops; Wheat rust Uredongus 1912 old print'Parasitic Fungi on Grain Crops; 1. Blade of wheat attacked by rust. 2. Portion of blade of wheat (magnified), showing the first stage of growth of rust called Uredo. 3. Section of leaf, showing uredospores protruding from leaf and threads of fungus (hyphae) feeding on cells of leaf. 4. Uredospores germinating and commencing to from the threadlike body (hyphae). 5. A Barberry leaf, showing the second stage in the life history of the rust (Aecidium).