Polyporus squamosus, known as Dryad’s Saddle or Pheasant’s Back and often placed in Cerioporus, is one of the most distinctive large polypores of spring. Its broad, scaly cap can produce a surprising watermelon or cucumber-like scent, while its biology spans both living and dead hardwood.

Dive deeper on the blog: https://lichenthevibe.com/cerioporus-squamosus-dryads-saddle/

In this episode, two hosts examine its fan-shaped yellow-brown caps, dark scales, thick stem, broad angular pores and soft flesh when young. They explore its unusual ecological transition from parasite on living hardwoods such as elm, maple, ash and beech to a white-rot saprobe that continues decomposing the dead wood.

The conversation then moves into chemistry and molecular biology, focusing on PSL, a highly specific lectin that recognizes 6′-sialylated structures on N-glycans and has applications in glycobiology. Research has also identified trehalose, p-hydroxybenzoic acid, β-tocopherol and polyunsaturated fatty acids, while laboratory studies have reported antioxidant, antibacterial, antibiofilm and antiquorum-sensing activity.

The hosts carefully distinguish laboratory findings from proven health effects, field observations and the long tradition of harvesting young Dryad’s Saddle as a spring edible. The episode also considers its relationships with fungus beetles and its important role in forest decomposition.

From its distinctive fragrance to its specialized lectin, Polyporus squamosus demonstrates how a familiar woodland mushroom can connect forest ecology, gastronomy and molecular research.

Polyporus squamosus, Dryad’s Saddle, Pheasant’s Back, Cerioporus squamosus, watermelon mushroom, scaly polypore, spring mushrooms, white rot, hardwood fungi, polypore lectin, PSL lectin, glycobiology, N-glycans, mushroom chemistry, antibiofilm activity, Pseudomonas aeruginosa, fungal ecology, mycology

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