Strain S16–07T produced branched, nonfragmented substrate mycelium. The aerial mycelia harbored spore chains of hooks, open loops or primitive spiral, which belong to retinaculum apertum type of morphology that consisted of 10 or more spores per chain. Spore chain morphology of strain S16–07T was different from other closely related species as follow: S. smyrnaeus SM3501T produced spiral spore chains;10 S. abikoensis NBRC 13860T produced straight spore chains;7 S. thermocarboxydovorans NBRC 16324T formed spores in long straight to flexuous8 and S. lilacinus ISP 5254T produced verticillate spore chain.9 The spores of strain S16–07T were oval to rod shaped and 0.5 × 1.0 μm in size. Spore surface was smooth (Figure 1). The cultural characteristics of strain S16–07T on different kinds of media are presented in Table 1. Strain S16–07T showed good growth on ISP medium 2, ISP medium 5 and Czapek’s agar and moderate growth on several media including ISP medium 3, ISP medium 4, nutrient agar and PDA. The substrate mycelium of strain on most media tested was white to pale yellow with whitish aerial spore mass. Pale yellow to yellow diffusible pigment was detected when the strain was cultured on ISP medium 2, ISP medium 3, ISP medium 4 and PDA. Melanin pigment was not observed on both ISP medium 6 and ISP medium 7.