Armillaria mellea. Chiodini ('little nails), are also known as stump mushrooms because they appear in woodlands growing out of stumps or logs in autumn, with small yellowish heads and long stalks. Boil 'em first, they're slightly toxic (only the caps are edible).
They are used in a dish from the Friulian Dolomites called balote e chiodini made with ricotta and polenta that suitors would present to the family when asking for a daughter's hand in marriage. If the family put the balote by the fire to bake, it meant the marriage could go ahead.
Image by Jean-Pol GRANDMONT, GNU Free Documentation License