te·li·um 
(tēlē-əm)
(tēlē-əm)n. pl. te·li·a (-lē-ə)
A blackish pustulelike structure that is formed in the tissue of a plant infected by a rust fungus and produces teliospores.
[New Latin, from Greek teleios, complete; see TELEOLOGY.]
teli·al (-lē-əl) adj.