f Micromonospora purpureochromogenes (Waksman and Curtis 1916) comb. nov. (Subjective Synonym: Micromonospora fusca Jensen 1932)

A search for a suitable strain to serve as the neotype for Micromonospora fusca Jensen 1932 has uncovered a number of Micromonospora strains which produce a dark-brown, agar-diffusible pigment and which are physiologically and morphologically similar to M. fusca. One of the strains resembling M. fusca is IMRU 3343 (= ATCC 27007), the type strain of Streptomyces purpureochromogenes (Waksman and Curtis 1916) Waksman and Henrici, 1948. [The strain of Streptomyces purpureochromogenus (sic) held at the Centraalbureau voor Schimmelcultures, Baarn, Netherlands, and S. purpureochromogenes ATCC 3343 have been identified as belonging to S. griseus, and they bear no relationship to IMRU 3343 or to the original description of Actinomyces purpeo-chromogenus (sic). Waksman and Curtis 1916.] It has been determined that the type strain (IMRU 3343) of S. purpureochromogenes is a micromonospora, and therefore this organism is transferred to the genus Micromonospora ørskov as M. purpureochromogenes (Waksman and Curtis) comb. nov. Because the species M. purpureochromogenes and M. fusca are so similar, their names are here regarded as subjective synonyms. The specific epithet purpureochromogenes has priority over fusca, and the correct name of this organism is therefore M. purpureochromogenes.