RT Journal Article SR Electronic(1) A1 Cummins, C. S. A1 Johnson, J. L.YR 1971 T1 Taxonomy of the Clostridia: Wall Composition and DNA Homologies in Clostridium butyricum and Other Butyric Acid-producing Clostridia JF Microbiology, VO 67 IS 1 SP 33 OP 46 DO https://doi.org/10.1099/00221287-67-1-33 PB Microbiology Society, SN 1465-2080, AB Summary: Strains designated as Clostridium butyricum were found to constitute two distinct groups on the basis of wall sugar patterns, nucleotide-sequence similarities of DNA preparations and nutritional requirements. Organisms in homology group I had walls which contained only glucose and would grow in a mineral salts-glucose medium with 0·05 μg./ml. biotin, although growth was improved by the addition of amino acids. Some strains labelled C. multifermentans and C. fallax belonged to this group. Organisms in homology group II had glucose and galactose as wall sugars and would not grow in mineral salts-glucose medium with amino acids and 10 vitamins unless yeast extract was also added. Strains of C. amylolyticum, C. rubrum, C. beijerinckii, C. lacto-acetophilum and some strains labelled C. multifermentans belonged to group II. It is recommended that the name Clostridium butyricum be retained for the organisms in group I, while C. beijerinckii is suggested for group II. Some of the strains labelled C. fallax and the strains of C. acetobutylicum, C. aurantibutyricum, C. pasteurianum and C. tyrobutyricum did not belong to either group., UL https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-67-1-33