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I am growing Bacillus pumilus and I have plated some on agar plates. Now I can see some colonies on top of the lawn.

lawn of *Bacillus pumilus* with unidentified colonies on top

Does anybody know what they could be? A contaminant? Bacillus pumilus? I have observed some people growing Bacillus pumilus, and the colonies they streaked looked different than mine. Could it be that B. pumilus has several colony phenotypes?

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