Oidium

[oh-id-ee-uh m] /oʊˈɪd i əm/

noun, plural oidia
[oh-id-ee-uh] /oʊˈɪd i ə/ (Show IPA). Mycology.
1.
one of the conidia that are borne in chains by certain fungi.
2.
(in certain fungi) a thin-walled spore derived from the fragmentation of a hypha into its component cells.
/əʊˈɪdɪəm/
noun (pl) -ia (-ɪə)
1.
(botany) any of various fungal spores produced in the form of a chain by the development of septa in a hypha