pseudomonas jessenii pseudomonas jessenii pseudomonas jessenii is a fluorescent, gram-negative, rod-shaped bacterium isolated from natural mineral waters in france. the type strain is cip 105274. pseudomonas jessenii scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: pseudomonadaceae genus: pseudomonas species: p. jessenii binomial name pseudomonas jesseniiverhille, et al., 1999