The Winter Polypore (Polyporus brumalis) is a cold-season wood decomposer with an unusually sophisticated oxidative enzyme system. Growing primarily on dead hardwoods such as birch, it produces persistent, leathery fruitbodies that can survive through winter.

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Two hosts examine the species' expanded arsenal of lignin-degrading peroxidases, including manganese and versatile peroxidases, along with oxidoreductases involved in supplying the hydrogen peroxide required for oxidative wood decay. Multi-omics research suggests these systems contribute to its ability to efficiently delignify complex plant biomass.

The episode also explores its unusual secondary metabolism. Under laboratory conditions, P. brumalis has been shown to produce the eudesmane sesquiterpenes β-eudesmane and β-eudesmol, with transcriptomic evidence pointing toward increased activity in terpene-biosynthesis pathways.

Its ability to degrade dibutyl phthalate adds another intriguing dimension to its potential biotechnological relevance.

The result is a close look at a seemingly modest winter polypore whose cold-season ecology, powerful wood-degrading enzymes and specialized chemistry make it an unusually interesting fungus for modern mycology.

Polyporus brumalis, Winter Polypore, Lentinus brumalis, lignin degradation, fungal enzymes, white rot, β-eudesmol, eudesmane, biomass conversion, fungal biotechnology

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