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On the basis of morphological and biochemical criteria, Actinomadura dassonvillei (Brocq-Rousseu) Lechevalier and Lechevalier, the former Nocardia dassonvillei (Brocq-Rousseu) Liegard and Landrieu, is removed from the genus Actinomadura Lechevalier and Lechevalier to a new genus, Nocardiopsis. It is proposed that this new genus harbors aerobic actinomycetes with a nocardioform substrate mycelium, an aerial mycelium, and a cell wall containing meso-2,6-diaminopimelic acid but not madurose or other diagnostically important carbohydrates. The type species is Nocardiopsis dassonvillei (Brocq-Rousseu) comb, nov., for which strain IMRU 509 (= ATCC 23218) is designated as the neotype. An outline of the characters which differentiate the new genus from the genera Nocardia, Actinomadura, and Streptomyces is given.
J. Meyer (Fri,) studied this question.