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Slime molds move, and lack chitin in their cell walls. They are now classified as belonging to the Kingdom Protista (Protoctista). Mycologists have studied them for so long that slime molds are still included in mycology textbooks.
Slime molds are easily recognized by their brightly colored structures. The most common slime molds on mulch appear as bright yellow, orange, or creamy tan irregular masses. The size of these masses can range from an inconspicuous inch to a dramatic several feet in diameter.