SUMMARY: Sixteen strains designated fifteen and ten were, together with strains of and subjected to numerical phenetic analyses using 96 unit characters. The data were examined using the simple matching ( ), Jaccard ( ) and pattern ( ) coefficients and clustering achieved using the unweighted average linkage algorithm. Cluster composition was not markedly affected by the coefficient used or by test error, estimated at 2.5%. The strains formed a distinct and homogeneous cluster in an aggregate taxon corresponding to the genus The and strains were recovered in well-defined and homogeneous phena within the genus consistently showed a high overall similarity with clusters equated with and while the cluster was not closely associated with any of the mycobacterial clusters. The results are discussed in the light of other developments in the taxonomy of the bovine farcy bacteria.


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