Porcini mushrooms are naturally found in the temperate and boreal zones of Europe, Asia, and North America. They have been introduced via tree plantations to Australia, New Zealand, and southern Africa. These terrestrial mushrooms occur in forests, parks, and plantations, where they form symbiotic mycorrhizal relationships with broadleaf and coniferous trees, including spruce, pine, hemlock, fir, birch, oak, beech, and chestnut. It is difficult to cultivate these mushrooms because of this symbiotic relationship that they share with trees.
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