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Medium-sized, smooth colonies with an entire margin.
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| The same Blood Agar plate examined with transmitted light. The colonies are surrounded by a haemolytic zone which is as wide as the zone seen around Bacillus cereus colonies. However colonies of B. sphaericus are much smoother than those of B. cereus and the two species are very different when viewed under the microscope. |
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| General characteristics: Gram-variable, large, spore-forming rods with a diameter < 0.9 µm. Catalase-positive. Lecithinase-negative. Does not attack sugars. Motile. |
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