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a gill mushroom (family Agaricaceae). The bulging cap is 5–10 cm in diameter and has a blunt tubercle in the center. It is mucosal and yellowish green, with a darker part in the center. The stem is frequently almost entirely hidden in the sand. The flesh is white, yellowish under the skin. The mushroom is distributed in Europe, Asia, and North America. It grows mainly in pine forests in autumn. It is classified by its nutritive properties as a mushroom of the fourth class.