For readers of Entangled Life and The Hidden Life of Trees comes an illuminating account of the "invisible" fungi that share our world: from the air we breathe to the dust beneath our feet. The Hidden Kingdom of Fungi traces the intricate connections between fungi and all life on Earth to show how these remarkable microbes enrich our lives: from releasing the carbon in plants for the benefit of all organisms to transmitting information between trees, to producing life-changing medicine, to adding umami flavor and B vitamins to our food.