Pycnoporellus alboluteus, commonly known as the orange sponge polypore, is a species of polypore fungus in the family Fomitopsidaceae. The soft, spongy orange fruit bodies grow spread out on the surface of fallen logs. Mature specimens have tooth-like or jagged pore edges.

Distributed throughout the boreal conifer zone, the fungus is found in mountainous regions of western North America and in Europe. It causes a brown cubical rot of conifer wood, especially spruce, but also fir and poplar. A snowbank mushroom, it can often be found growing on logs or stumps protruding through melting snow.

Several species of beetles use the fungus as a food source. Its edibility to humans is unknown.

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