Mushrooms Demystified: A Comprehensive Guide to the Fleshy Fungi is a mushroom field and identification guide by American mycologist David Arora, published in 1979 and republished in 1986. All That the Rain Promises and Moreâ¦: A Hip Pocket Guide to Western Mushrooms, a âÂÂfield companionâ to Mushrooms Demystified with cross references to that volume was published in 1991.