A new genus of acidophilic, facultatively methylotrophic bacteria is described. These organisms are gram-negative, nonsporeforming, nonmotile, and rod shaped and grow at pH 2.0 to 5.5. These characteristics are unique among the methanol-utilizing bacteria. The deoxyribonucleic acid base composition is 63 to 65 mol% guanine plus cytosine. TK 0705 (T = type strain) is a typical strain in this group. These bacteria are distinguished from type and representative strains of , and on the basis of deoxyribonucleic acid-deoxyribonucleic acid homology. A new genus, , is proposed to include this group of methylotrophic bacteria. The type species of the genus is comb, nov., with type strain TK 0705 (= IMET 10945).


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