[Taxonomic characters of "Clostridium tyrobutyricum" (author's transl)].

The taxonomic characters of 77 strains of Clostridium tyrobutyricum have been studied and compared to those of known strains. This work shows the insufficiency of the Bergey's Manual (8th edition) nine characters distinguishing Clostridium groupe I to identify C. tyrobutyricum. To be more representative of the species, addition of one or two characters to this key of determination and some modifications to the complementary description of C. tyrobutyricum in this manual are proposed.