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Pholiota adiposa, widely known in the culinary world as the Chestnut Mushroom (distinct from the brown Agaricus bisporus), is a striking wood-rotting fungus belonging to the family Strophariaceae. It is characterized by its clustered growth habit and bright, golden-yellow to orange caps covered in distinctive gelatinous slime and concentric, rusty-brown triangular scales. As the mushroom matures, the convex cap flattens, often retaining veil remnants on the margin. The surface is notably viscid or glutinous when wet, a key feature distinguishing it from dry-capped lookalikes like Pholiota squarrosa. Ecologically, P. adiposa functions primarily as a saprotroph, decomposing dead hardwoods, though it can act as a weak parasite on living trees, entering through wounds. It plays a vital role in forest nutrient cycling, breaking down lignin and cellulose in beech, maple, poplar, and oak. The species is part of a taxonomically complex group (including P. aurivella and P. limonella) often separated only by microscopic features such as spore size and cystidia shape. In cultivation, it is prized for its crunchy texture and nutty flavor, developing long, edible stems and small caps when grown in high-humidity, low-CO2 environments.
Native: East Asia (China, Japan, Korea), Europe, North America. Introduced: Globally cultivated in controlled environments. Widespread in the Northern Hemisphere, though distribution maps are often conflated with the morphologically similar Pholiota aurivella and Pholiota limonella.
No strains cataloged yet for this species.
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