Liberty caps grow solitarily or in teams on abundant and acidic soil, typically in grasslands, which include meadows, pastures, or lawns. You may typically find these mushrooms in pastures, where sheep and cow dung fertilize the soil. Having said that, the mushrooms tend not to grow specifically on the dung https://ukmushroomspores.co.uk/product-tag/1-oz-dried-porcini-mushrooms/