Pholiota squarrosa is a familiar woodland mushroom, but its chemistry has made it surprisingly important to modern fungal research.

This episode explores the species' distinctive dry, heavily scaled appearance, its white-rot lifestyle, and its unusual relationship with weakened trees. The hosts then examine compounds such as squarrosidine and pinillidine, which have demonstrated xanthine oxidase inhibition in laboratory research.

The centerpiece is PhoSL, an exceptionally small 40-amino-acid lectin with remarkable specificity for core-fucosylated N-glycans. Researchers have investigated its structure and applications in cancer glycobiology, including the study of altered fucosylation and AFP-L3.

The episode also examines laboratory research into PhoSL and SARS-CoV-2 spike protein, while clearly separating experimental findings from claims about medical treatment.

Finally, the discussion covers the species' status as the type species of Pholiota, its reported gastrointestinal effects, and why this ordinary-looking mushroom continues to attract researchers across mycology, biochemistry and glycobiology.

Pholiota squarrosa, shaggy scalycap, PhoSL lectin, mushroom lectin, core fucose, glycobiology, cancer research, fungal chemistry, xanthine oxidase, squarrosidine, pinillidine, white rot fungus, mushroom science, mycology, SARS-CoV-2 research, AFP-L3, fungal biology, mycology podcast

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