Porcini, Boletus edulis, also known as edible tuber hat, is a common and tasteful mushroom. It grows in deciduous and coniferous forests and thrives on lean soil.
The mushroom can be known from the hemispherical, gray-brown and greasy hat as well as the light brown to white stick covered by a fine net. The hat is typically between 5 and 20 cm in diameter but can be seen occasionally larger. The log is between 6 and 16 cm high and usually 2-5 cm in diameter.
The taste of Porcini is mild and nutty.
The fungus is common in Danish forests and is usually seen between August and November.
A rainy and warm autumn gives many Porcini mushrooms why this phenomenon is called a "Karl Johan year".