Correct spelling for the English word "Ignigenous" is [ɪɡnˈɪd͡ʒənəs], [ɪɡnˈɪdʒənəs], [ɪ_ɡ_n_ˈɪ_dʒ_ə_n_ə_s] (IPA phonetic alphabet).
Produced by fire; fire-formed-referring to the result rather than to the operation or agency.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.