A numerical taxonomic study was made of strains belonging to the genera and together with a few strains from allied genera. They were examined for 139 characters covering a wide range of tests and properties. The strains fell into two major groups. Group A contained and Group B contained eight main clusters, representing, respectively, combined with and two clusters containing and strains. and the three clusters of (including ) were more similar to one another than to the other clusters; it is suggested that the family should comprise these three genera, and that the other genera should be placed elsewhere.


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