pseudomonas rubescens pseudomonas rubescens pseudomonas rubescens is a gram-negative soil bacterium that was originally isolated from the oil in a machine shop. the type strain is atcc 12099. pseudomonas rubescens scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: pseudomonadaceae genus: pseudomonas species: p. rubescens binomial name pseudomonas rubescenspivnick 1955