A morphological and physiological study of the brown halophilic mold Sporendonema epizoum (Corda), commonly called Torula epizoa, has been made. The organism is truly halophilic, optimum 10 to 15% salt. Optimum relative humidity, 75%. Growth over wide pH range. The fungistatic properties of various preservatives, particularly the fatty acids and some of their salts, were investigated. Sodium propionate was found effective and suitable for commercial control of the organism.