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Thirty-five strains ofClostridium bifermentans were, in most part, culturally homogeneous by conventional taxonomic criteria but were heterogeneous with respect to spore fine structure. Fourteen of the strains produced spores with appendages, distributed among four distinct ultrastructural types. No consistent correlation existed between spore type and other variable properties of these strains. It is proposed, therefore, that these spore appendage-type strains be considered as “varieties” ofC. bifermentans and that they should not be designated as new species.

Taxonomic Implications of Spore Fine Structure in Clostridium bifermentans