Thermophilic bacteria, Thermus ruber, that produce a bright orange pigment

A non-sporeforming gram-negative bacterium isolated from soils of Africa was shown to belong to the species Thermus ruber in its morphologo-cytological and physiologobiochemical properties. It differed from the Thermus ruber species described elsewhere (Loginova et al., 1975; Loginova and Egorova, 1975) only on colour: the former contained a bright-red pigment while the latter produced bright-orange pigments.