Abstract
A simple and effective method of isolating Sarcina ureae (Beijerinck) Lohnis from soils consists in direct plating on an agar containing 10% urea. The organism was found to occur in numbers between 10000 and 20000 per g in fertile soils. Fifteen recently-isolated strains were found to be identical with a strain preserved by Beijerinck, and a description is given of their morphological, physiological and cultural characters. The organism is a definite Coccus. Spores, which tolerate exposure at 100° C for periods up to 5 minutes, are formed readily on an agar with a reaction of p H6.8–7, containing ammonium salts and sub-optimal concentrations of other nutrients. Sarcina pulmonum Virchow, Sarcina fimentaria L. et N. (Planosarcina Samesii Migula) and Urosarcina psychrocarterica Rubentschik are similar and possibly identical types.
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