This shows two different varieties of polypore fungus.
One has a smooth back side.
Their simple, shelving fruiting bodies have a smooth hymenium, lacking gills or tubes.
It is called false turkey tail sterium.
One has a gilled back side.
Gloeophyllum sepiarium, the rusty gilled polypore
This is a rusty gilled polypore.
Polypores are also called bracket fungi or shelf fungi, and they characteristically produce woody, shelf- or bracket-shaped or occasionally circular fruiting bodies that are called conks.