- rust, rust fungus - any of various fungi causing rust disease in plants
--1 is a kind of fungus
--1 is a member of Uredinales, order Uredinales
--1 has parts: aecium; aeciospore
--1 has particulars:flax rust, flax rust fungus, Melampsora lini; blister rust, Cronartium ribicola; wheat rust, Puccinia graminis; apple rust, cedar-apple rust, Gymnosporangium juniperi-virginianae