Frederick A StevensFrederick A. Stevens has a doctorate in botany from UCLA. He has photographed and studied the macrofungi of the San Francisco Bay Area for more than two decades, with a special interest in gasteromycetes and the genus Agaricus. Stevens is the oauthor, with Michael G. Wood, of The Fungi of California (californiafungi.com), and a past president of the Mycological Society of San Francisco. He has led numerous mushroom walks and consults with physicians and veterinarians on mushroom poisonings. Read More Read Less