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Abstract. Two strains of obligately anaerobic, thermophilic spirochetes were isolated from cyanobacterial mat samples collected at freshwater hot springs in Oregon and Utah, USA. The isolates grew optimally between 48 and 52C, and did not grow at 25 or 60C. Both strains fermented various pentoses, hexoses, and disaccharides. Amino acids or cellulose did not serve as fermentable substrates for growth...