Abstract
Numerical classification of scotochromogenic mycobacteria revealed the presence of four groups: (1) Mycobacterium xenopei; (2) M. marianum, M. scrofulaceum, M. aquae and M. gordonae; (3) M. acapulcensis and M. flavescens; and (4) M. aurum. Each of these groups was considered to be a species. Characteristics of these groups were described.

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