Noun rust fungus has 1 sense
  1. 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
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