Spermagonia or pycnia a. Spermagonia are pear-shaped c. The dikaryon filament grows downward into the spongy parenchyma where it produces an aecium 4. Aeciospores are produced in the aecia . The hyphae penetrate individual cells with their haustoria and obtain nourishment directly out of the cell 5.
Spores are single-celled d. Spores are dikaryon e.
The uredospores as they are produced continue to infect wheat plants while they are growing and maturing 6. The spores are black f.