A companionable foray into the realm of stinkhorns, black mold, yeast, and even Malassezia, the dandruff-related fungus that Head & Shoulders shampoo is designed to combat. Money is an English-born mycologist who has spent his life uncovering the secrets and lore of fungi, including varieties that thrive in solid granite, feed on human flesh, assist in crime-scene investigations, and, as in the case of a particular armillaria covering twenty-two hundred acres in Oregon, grow to become the largest organisms on earth.