SUMMARY: On the basis of cluster analysis, average similarities within and between groups, and DNA base composition of selected strains, appeared to be a distinct species comprising several biotypes. Although some or all of these biotypes, represented by subclusters in our computer study, may ultimately warrant recognition as separate species, our results were not conclusive enough to warrant such a proposal at present. Most strains tentatively named could be included in so that the name which was validly published whilst was not, takes priority over , Strains of Group Va (Tatum 1974) examined were also included in Group IVd (King, 1964) did not appear to be a natural group but some of the strains could also be included in


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