According to Szabo and Fernandez (1984), this species is a later heterotypic synonym of "Actinomycespurpeochromogenus" Waksman and Curtis 1916.Publication:
Szabó Z, Fernandez C. Micromonospora brunnea Sveshnikova, Maksimova, and Kudrina 1969 is a junior subjective synonym of Micromonospora purpureochromogenes (Waksman and Curtis 1916) Luedemann 1971. Int. J. Syst. Bacteriol. 1984; 34:463-464.