The Bubble Gum Polypore, Gloeoporus dichrous, is an interesting mushroom because the white surface faces up and the colored side faces down (unless it's growing resupinate, as in the last photo). This polypore has angular pores 4-6 per mm. The white upper surface can be glabrous or tomentose, and the individual caps often fuse. When these are fresh, they are elastic like bubble gum. They're saprotrophic and cause a white rot.
Gloeoporus means "a glutinous polypore"; dichrous means "having two colors."