Antibiotics Formed by Species of Emericellopsis

Abstract
The eight species of Emericellopsis were grown in two media at 25[degree]C with and without added DL-methionine. Five species, E. minima, E. mirabilis, E. salmosynnemata, E. terricola var. glabra, and W.S.F. 47 formed cephalosporin N (a penicillin). E. humicola formed only cephalosporin P. E. sp. (C.M.I. 41,937), formed both antibiotics. E. terricola formed neither. Apparently only the two species, E. salmosynnemata and C.M.I. 41,937 made more cephalosporin N in the presence of added DL-methionine than in its absence.