Cryptoporus volvatus
Encyclopedia
Cryptoporus volvatus is a polypore fungus
Fungus
A fungus is a member of a large group of eukaryotic organisms that includes microorganisms such as yeasts and molds , as well as the more familiar mushrooms. These organisms are classified as a kingdom, Fungi, which is separate from plants, animals, and bacteria...

 that decomposes the rotting sapwood of conifers. It is an after effect of the pine bark beetle bug attack. Also known as the "Grey-Brown Sap Rot" mushroom.
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