SUMMARY: A numerical taxonomic study of strains of together with representatives of allied genera, showed 28 reasonably distinct phenons. The major areas, with their phenons, were: () enterococcal species group ( and a proposed new species ); () paraviridans species group ( and an unidentified Oral Group I); () lactic species group ( including ); () thermophilic species group (); () viridans species group ( a proposed new species and ); () pyogenic species group ( including ‘ and a cluster of Lancefield Group B strains of human origin); () parapyogenic species group ( and a cluster of strains of Lancefield Groups R, S and T). Species of and are very closely related to the streptococci.


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