1887

Abstract

Two hundred and twenty-two representatives of the and related taxa, including reference cultures, received strains and fresh isolates, were tested using 124 unit characters. The data were examined using numerical taxonomic techniques with various coefficients and average linkage clustering; the variation in composition of the clusters obtained from the different coefficients was slight. Most species included in the study formed discrete phena, which exhibited good differential characters. was particularly well-defined and and , although grouping together, did show divergence in several test results. was initially linked with representatives of genera other than , these being and . The strains of and formed tight distinct clusters associated only at low similarity levels with other members of the family . The phenon, although well-defined, appeared to consist of two subclusters which could be assigned to serotypes 1 and 2. Tests which may be useful in identification are tabulated and the relationships between the various taxa are discussed.

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1981-12-01
2021-07-24
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