hyphomicrobium hollandicum hyphomicrobium hollandicum hyphomicrobium hollandicum is an aerobic bacteria from the genus of hyphomicrobium which was isolated from soil in california in the us. hyphomicrobium hollandicum scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: hyphomicrobiaceae genus: hyphomicrobium species: h. hollandicum binomial name hyphomicrobium hollandicumhirsch 1989 type strain atcc 27498, ifam kb-677, kb-677