SUMMARY: Eight strains of , 89 representatives of the genera and and a single strain of were the subject of numerical phenetic analyses using 92 unit characters. The cluster was robust in different numerical analyses and equivalent in rank to the genera and . The presence of a characteristic mycolic acid and completely unsaturated menaquinones distinguished strains from mycobacteria, nocardiae and rhodococci. The congruence between the numerical and phenetic data indicate that strains form a distinct taxon resembling other mycolic acid-containing taxa in wall, fatty acid and polar lipid composition. Since the genus is no longer valid, a new niche is needed for .


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