The type cultures of four Actinomadura species (A. africana, A. coeruleofusca, A. flava, A. longispora) were studied and compared with the type culture belonging to the genus Nocardiopsis. In their morphological properties and in the composition of the cell wall, these cultures were shown to be closer to the genus Nocardiopsis Meyer 1976 rather than to the genus Actinomadura Lechevalier et Lechevalier 1970. Basing on these data, the species have been transferred to the genus Nocardiopsis.