probasidium
/ˌprəʊbəˈsɪdɪəm/Mycology
noun
Especially in a smut or rust: the structure or developmental stage of a basidium (often a teliospore) in which nuclear fusion of gametes (karyogamy) occurs.
Origin
Early 20th century; earliest use found in Annals of the Missouri Botanical Garden. From pro- + basidium, after French probaside.