Actinomycetes, which are widely distributed in nature, particularly in soil and plants, are producers of useful compounds, such as antibiotics. The research group led by Professor Yojiro Anzai of the Department of Microbiology, Faculty of Pharmaceutical Sciences, Toho University, has been working on the development of a new strain of actinomycetes. In the isolation experiment of actinomycetes endogenous to medicinal plants native to Mongolia, NUM-2625, which forms yellow colonies, was isolated from Comarum salesowianum. Subsequently, Dr. Tomohiko Tamura and his colleagues at Biological Resource Center, NITE, compared the genome sequences of NUM-2625 and existing related species, and clarified that NUM-2625 is a new species of the rare actinomycete genus Actinocatenispora. Although three species of the genus Actinocatenispora have been reported to date, they were all isolated from soil, and NUM-2625 is the first species of the genus Actinocatenispora isolated from plants. There have been few reports of new species of actinomycetes from Mongolia, and the results of this research are expected to lead to research on biodiversity and the search for new useful compounds.