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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.
Different kinds produce different fruiting bodies, the most common of which is some sort of sporangium from which spores are realeased for the next generation. There are about 450 species, which include mobile slime molds. See also the Plasmodiophoromycota (below). Cellular slime molds (the Dictyostelids or Dictyosteliomycota, of which Dictyostelium is an example).