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a spongy hymenomycetous mushroom of the family Boletaceae. Boletus badius resembles B. edulis in appearance. Its cap has a diameter of 4–10 cm and is hemispherical, domed (later becoming flat), usually sticky, and grayish brown or chestnut. The tubular layer of the cap is at first whitish, later turning greenish yellow. The stipe measures 4–8 cm long and is usually thick. The meat is white or pale yellow, turning bluish when broken. B. badius grows primarily in pine forests. In the USSR it is encountered most often in the western oblasts. In Western Europe it is considered one of the best edible mushrooms; in the USSR it is considered of second quality.