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| Generally large colonies with a dull or frost-glass surface and undulate margin.In areas of confluent growth the culture may appear to be impure due to growth of new younger colonies on top of the original colonies. This phenomenon may also be observed in cultures of Bacillus cereus. |
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The same Blood Agar plate examined with transmitted light. There is a wide haemolytic zone around the colonies.
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| General characteristics: Gram-positive rods with a diameter > 0.9 µm. In young cultures the cells may contain granula, in particular if the culture has been grown on a medium containing glucose. The cells may also contain parasporal crystal bodies. Catalase-positive. Attacks sugars by fermentation. Most strains are motile. |
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