Pholiota microspora
Pholiota microspora, commonly known as Pholiota nameko or shortly nameko, is a small, amber-brown mushroom with a slightly gelatinous coating that is used as an ingredient in miso soup and nabemono. In some countries this mushroom is available in kit form and can be grown at home. It is one of Japan's most popular cultivated mushrooms, tastes slightly nutty and is often used in stir-fries. They are also sold dried.
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In Mandarin Chinese the mushroom is known as 滑子蘑; or 滑菇;.
In Russia it is also consumed widely, and is known as "o-pyo-nok" or plural "o-pya-ta".
In America the mushroom is sometimes called a "butterscotch mushroom".