Template:POTD/2025-07-12
Slime mold is an informal name given to a polyphyletic assemblage of unrelated eukaryotic organisms in the clades Stramenopiles, Rhizaria, Discoba, Amoebozoa and Holomycota. Most are near-microscopic; those in Myxogastria form larger plasmodial slime molds that are visible to the naked eye. Most slime molds are terrestrial and free-living, typically in damp shady habitats such as in or on the surface of rotting wood. Some myxogastrians and protostelians are aquatic or semi-aquatic. The phytomyxea are parasitic, living inside their plant hosts. Geographically, slime molds are cosmopolitan in distribution. A small number of species occur in regions as dry as the Atacama Desert and as cold as the Arctic; they are abundant in the tropics, especially in rainforests. This picture shows a group of sporangia of the slime mold Comatricha nigra, photographed in a garden in Berlin, Germany.Photograph credit: Alexis Tinker-Tsavalas