A new species, , is proposed for an obligately aerobic, moderately acidophilic, endospore-forming bacterium that produces a thermostable, aciduric pullulanase (EC The organism was isolated from soil by selection on solid, pullulan-containing medium at pH 4.0 and 30°C. The isolate required a medium pH of less than 6.5 for growth initiation. Fatty acid composition studies revealed that the major fatty acid of cells grown in nutrient broth supplemented with 1% starch was 14-methylpentadecanoic acid (iso-C) at 45 mol%. The guanine-plus-cytosine content of the DNA of this organism was 45 ± 2 mol%. A type culture has been deposited with the American Type Culture Collection, Rockville, Md., as strain ATCC 53909.


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