- Volume 14, Issue 3, 1964

An examination of 104 strains of species included in the genus Thermoactionmycesxs from various sources and a critical study of the pertinent literture suggest the following revision of the genus:

Thermoactinomyces vulgaris Tsiklinsky 1899, 501 is the type species (monotype) of the genus, and alone should remian in the genus.

Thermoactinomyces thatpophilus Waksman and Corke 1953, 378 is a junior synonym of T. vulgaris.

Thermoactinomyces glaucus Henssen 1957 should be regarded as a nomen dubium.

Thermoactinomyces thermophilus (Berestnev) Waksman 1961, 308 should be regarded as a nomen dubium.

Thermoactinomyces monosporus (Lehmann and Schütze) Waksman 1953 should be regarded as a nomen dubium or as a possible synonym of Thermomonospora viridis (Schuurmans et al..) Küster and Locci comb. nov.

Thermoactinomyces viridis Schuuurmans et al. 1956 is transferred to the genus Thermomonospora as Thermomonospora viridis (Schuurmans et al.) Küster and Locci comb. nov.

Twenty media have been developed that have proved particularly useful for isolation and characterization of myxobacters from a northern freshwater eutrophic Lake. Formulae are given and special uses of each discussed. In most cases the media described have not previously been used. Some media (such as peptonized milk agar (PMA)) have proved useful because well adapted to growth of most species. Other media are important in determining the purity of cultures, particularly for detecting contaminating eubacteria. Certain media stimulate the development of myxangia (so-called “fruiting bodies” of myxobacters). Many formulae are primarily useful in differentiation and identification of species.