Fungi: The elegant agate-like fans of Trametes versicolor, or Turkey Tails.
Protista: Fruiting bodies of Ceratiomyxa fruticulosa or coral slime mold.
Plantae, Fungi, and Bacteria: come together in the lichen Lobaria oregana. Along with a fungus and an algae, these lichens have nitrogen-fixing cyanobacteria. When they fall from trees, they fertilize forest soils.