Also known as Puccinia graminis. This fungus is a significant detriment to cereal crops. It is currently spreading across Africa, Asia, and the Middle East. This image depicts a a spore of the fungus germinating and producing Sporidia on the tips of small stalks.
Nicholson, George The Illustrated Dictionary of Gardening, Div. VI (London, England: L. Upcott Gill, 1884)