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The 6th ed. of Bergey's Manual (1948) lists 261 names of species in the genus Pseudomonas, of which 148 a r e fully accepted and described in detail, 15 a r e believed better placed in the genus Xanthomonas, and 98 a r e l isted in the genus a s names of uncertain position. The genus is the l a r gest in the 1948 edition of Bergey's Manual. New species names a r e constantly being added to thegenus Pseudomonass frequently on the basis of some variable minor character is t ics o r solely on the basis of flagellation regardless of physiological character is t ics . In many instances the species character is t ics now listed a r e so vague and inadequate that laboratory reidentification of a culture that had lost its label would be impossible. This point is emphasized by the fact that, with few exceptions, investigators studying the genus (pr imari ly the species ,P. aeruginosa and P. f1uorescens)do not agree on the major character is t ics of tKe group. These controversies include such basic and fundamental differences a s typical colonial morphology, pigmentation, serological relationships , biochemical o r physiological character is t ics , odor, optimum temperature of growth, and even the ease, o r difficulty, of overall identification of the genus. (1,2, 5, 6,7, 9,10,11, 13,15,16, 17)* The type species of the genus,?. aeruginosa, can be isolated not only from feces, urine, skin burns, abscesses , chronic lung diseases, etc. , but a lso f r o m soil, water, and even plants. Because of the ubiquitous distribution of this and other species in the genus, when studying their character is t ics , one must recognize and consider carefully their adaptability and dissociation. I t is well known, for example, that cultures of ,P. aeruginosa frequently lose their

Taxonomic problems relating to the identification of species within the genus Pseudomonas