Relationships among Streptomycetes, Nocardiae, Mycobacteria and Other Actinomycetes

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Abstract
Some physiological reactions of 63 strains of actinomycetes, including 8 Mycobacterium, 29 as Nocardia, 18 as Streptomyces, 4 Jensenia, 2 as Micromonospora, 1 as Actinoplanes and 1 as Streptosporangium were studied. The microbes were arranged into a branching continuum in which the verticillate streptomycetes were together, as were the streptomycetes with spiral spore-chains and those with straight spore-chains. The noncardiae with persistent mycelial stages were intermediate between the streptomycetes and the mycobacteria. Cultures such as Jensenia canicruria, Mycobacterium rhodochrous and Nocardia coralllna were considered to originate from typical nocardiae. Susceptibility of 8 nocardiae and 4 mycobacteria was determined. Phage typing results indicate that the N. corallina group is more closely allied to N. asteroides and N. brasiliensis than to M. smegmatis and M. friburgensis.

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