Summary.During the course of an investigation ofZymomonasspp. in the brewing industry, a strain was isolated from different habitats and identified asZ. mobilis.It is the first occasion on which this species has been isolated from British beers. Closer examination of one isolate showed that it was different from the stock strain ofZ. mobilis, both in vitamin requirements and serology. Strains ofZ. anaerobiawere also isolated and it was possible to induce these bacteria to metabolize sucrose. Since the ability to utilize this sugar is one of the major differences betweenZ. mobilisandZ. anaerobia, and in view of the closeness of the G + C ratios, the whole question of whether 2 species ofZymomonasare justified is thrown into doubt.
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