Summary: The genus contains a number of biochemically and physiologically heterogeneous groups of organisms and needs taxonomic revision. In this study cellular fatty acids from a number of spp. were identified and quantified using gas chromatography and gas chromatography-mass spectrometry. The chemical data were then subjected to principal components analysis. In , which is the type species of the genus , C was the predominant fatty acid (38.0%) and C was present in higher amounts (32.7%) than C (14.6%). thus differed from all the other species examined: () , . (.) , . (.) , . (.) , . (.) , . (.) and () . Principal components analysis also enabled the closely related and to be differentiated.


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