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Pleurotus Ostreatus
Pleurotus ostreatus, the oyster mushroom, is a common edible mushroom. It was first cultivated in Germany as a subsistence measure during World War and is now grown commercially around the world for food. However, the first documented cultivation was by Kaufert. There is some question about the name Pleurotus corticatus, but no question that he cultivated an oyster mushroom. It is related to the similarly cultivated "king oyster mushroom". Oyster mushrooms can also be used industrially for mycoremediation purposes. The oyster mushroom may be considered a medicinal mushroom, since it contains statins such as lovastatin which work to reduce cholesterol. The oyster mushroom is one of the more commonly sought wild mushrooms, though it can also be cultivated on straw and other media. It often has the scent of anise due to the presence of benzaldehyde (which, however, smells more like almonds). Wikipedia
Next to a hiking trail near Jack London State Park, Glen Ellen, CA.