Summary: Representatives of a large number of bacterial isolates that produced clearings in xylan agar medium in an earlier study were characterized in greater detail. Butyrivibrios and ruminococci predominated. Three different biotypes of , all non-cellulolytic, were identified on the basis of net acetate production or uptake, or the production of propionate. The only variable characteristic observed within the group of isolates was the ability to solubilize cellulose. In contrast, all typical isolates were cellulolytic. Other bacteria that occurred in smaller numbers belonged to the genera and


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