Mushrooms that are mycorrhizal are involved in a symbiotic (mutually beneficial) relationship with the tiny rootlets of plants--usually trees. The cells of the mushroom's mycelium surround the tree rootlets with a sheath, and the mushroom helps the tree absorb water and nutrients while the tree provides sugars and amino acids to the mushroom. The organisms may need each other to survive. It is estimated that about 85% of plants depend on mycorrhizal relationships with fungi (Kirk et al., 2001; Dictionary of the Fungi). Many mushrooms are mycorrhizal with plants, including most Amanitas and Russulas.
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