Streptomyces sp. strain No. B2847 producing a new antibiotic, tolypomycin Y, was examined with reference to its taxonomic characteristics. The organism is characterized by the formation of sclerotic granules, which originate from aerial mycelia and are observed on most agar media. Other properties were compared with known species. The strain was judged to be a new species and the name Streptomyces tolypophorus nov. sp. proposed.
