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To determine the growth, correlation between sporulation and acetic acid production and effect of buffering agent at high substrate cellulose concentrations of the strain Clostiridium lentocellum SG6.The strain SG6 was grown in cellulose mineral salt medium containing cellulose (Whatman No. 1 filter paper, Whatmore International Ltd., Maidstone, UK) or cellobiose. The strain fermented cellulose even after several transfers on cellobiose medium. The formation of endospores on third day onwards indicated the lowering of pH in the medium because of the formation of acetic acid. Maintaining the pH 7·2 at higher substrate concentrations resulted in increase of biomass, cellulose fermentation, acetic acid production, etc.The strain SG6, with its high fermentation yields and sporulating character can become a potential strain for acetic acid production and also as a probiotic strain in animal nutrition.The direct conversion of cellulosic biomass to acetic acid can eliminate expensive three-step saccharification, fermentation processes. The strain SG6 can ferment cellulose at high substrate concentrations.