Pholiota microspora, commonly known as Pholiota nameko or shortly nameko (ナメコ), 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.
(Berk.) Sacc. (1887)
In Russia it is also consumed widely, and is known as (often sold as) "o-pyo-nok" (опёнок) or plural "o-pya-ta" (опята).
In America the mushroom is sometimes called a "butterscotch mushroom".