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Description of Bacillus subtilisGrows as a unicellular rod, seldom as chains. Degrades pectin and polysaccharides in plant tissues, and some strains cause rots in live potato tubers. Endospores are widespread. Vegetative organisms take part in various stages in the early breakdown of materials of plant and animal origin. Grows in non acid food under aerobic conditions. Causative agent of ropy (slimy) bread. Very extensively studied.