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Carbon repligraphic comparison of eight cultures described as Streptomyces hygroscopicus showed four distinct types. Five of the cultures could be considered S. hygroscopicus by spore type (a relatively nonsegmented spore structure with an extremely wrinkled surface); three of the cultures had spore types that differed from one another and from the hygroscopicus holotype. Differentiation was confirmed by Ektacolor pattern.doi:10.1128/aem.16.6.935-941.1968 fatcat:zmtdwqtc7feabcibtcgdfwshsq