A Gram-positive, coccus-shaped, lactic acid bacterium, strain LMG 23082T, was isolated from steeped maize grains. The organism is homofermentative and produces D- and L-lactic acid from glucose. 16S rRNA gene sequence analysis revealed that the organism belongs to the genus Pediococcus, with Pediococcus pentosaceus and Pediococcus acidilactici as nearest neighbours. Genotypic fingerprinting, whole-cell protein electrophoresis, DNA-DNA hybridizations and physiological and biochemical tests allowed differentiation of strain LMG 23082T from other established Pediococcus species. A remarkable feature was that, unlike other pediococci, this bacterium was capable of growth at pH 9.0. The strain studied represents a novel species for which the name Pediococcus stilesii sp. nov. is proposed with the type strain LMG 23082T (=BFE 1652T=FAIR-E 180T=CCUG 51290T), the only currently known isolate of the species.
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