noun retÂ·roÂ·gresÂ·sion \Ëre-trÉ-Ëgresh-Én\. : a reversal in development or condition: asa: return to a former and less complex level of development or organizationb: subsidence or decline of symptoms or manifestations of a disease.
Habitat. Slime molds live in somewhat variable habitats all over the world. Generally slime molds live in damp areas of vegetation. They live under rotting logs and damp leaves. Some of the other habitats that slime molds will inhabit include water such as tropical fish tanks.
Introduction to the Slime Molds. Long classified together in the Myxomycophyta as part of the Fungi, slime molds are now known to be quite unrelated to the fungi. There are three main groups of slime molds, which do not form a clade. Plasmodial slime molds, like Physarum shown here, are basically enormous single cells with thousands of nuclei.