uredinium
noun
ure·din·i·um
ˌyu̇r-ə-ˈdi-nē-əm
plural uredinia
ˌyu̇r-ə-ˈdi-nē-ə
: a usually reddish or black mass of hyphae and spores of a rust fungus forming pustules that rupture the host's cuticle
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Merriam-Webster unabridged
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