 Some of these variations include changes in surface film or mucus production, changes in texture (such as addition of ridges), or changes in shape (such as circular to polygon-like).While the microbial colonies of "P. stutzeri" can alter based on what medium the bacterium is grown on, there are conserved, distinguishable characteristics that are apparent in almost every colony of this species.When examined on solid media, this bacterium has dry, rigid colonies that cling together so tightly it is often easier to remove an entire colony, if needed, rather than just a piece of one.