pseudomonas congelans pseudomonas congelans pseudomonas congelans is a fluorescent, gram-negative bacterium isolated from the phyllosphere of grasses. the type strain is dsm 14939. pseudomonas congelans scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: pseudomonadaceae genus: pseudomonas species: p. congelans binomial name pseudomonas congelansbehrendt, et al. 2003