strep·to·my·ces 
(strĕp′tə-mīsēz)
(strĕp′tə-mīsēz)n. pl. streptomyces
Any of various actinomycetes of the genus Streptomyces, found chiefly in soil and including several species that produce antibiotics.
[New Latin Streptomycēs, genus name : STREPTO- + Greek mukēs, fungus.]