Abstract
SUMMARY Antibacterial activity against Micrococcus pyogenes var. aureus, Salmonella typhimurium, Escherichia coli, and/or Mycobacterium 607 was demonstrated by eight strains of Cephalosporium on agar plates. Six of these eight strains formed synnematin or a synnematinlike substance in shaken broth cultures. Forty-two other strains of Cephalosporium and Tilachlidium showed no antibacterial activity. The name Cephalosporium salmosynnematum is proposed for strain M.D.H. 3590A.