nocardioides zeicaulis nocardioides zeicaulis nocardioides zeicaulis is a gram-positive and aerobic bacterium from the genus nocardioides which has been isolated from the stem of a maize plant (zea mays). nocardioides zeicaulis scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: propionibacteriales family: nocardioidaceae genus: nocardioides species: n. zeicaulis binomial name nocardioides zeicauliskämpfer et al. 2016 type strain ccm 8654cip 110980jm-601