Abstract
Many thermophilic actinomycetes were isolated from samples collected from a hot-spring, lake and soil in Yunnan, China. Chemical and molecular classification of four selected strains of thermophilic Streptomyces with an upper limited growth temperature of 65–68 °C and autolytic characteristics was carried out. A new species, Streptomyces thermogriseus sp. nov. is described. The type strain is Y-14046T(= CCTCC AA97014T).