American mycologist.
Roy Edward Halling (born December 31, 1950, in Perry, Iowa) is an American mycologist. Halling specializes in the study of mushroom-forming fungi, especially the taxonomy, ecology, and systematics of the Boletineae, a suborder of the Boletales, and is widely published in this area. He is currently emeritus curator of mycology at the New York Botanical Garden, and was an adjunct professor at Columbia University. Halling received his master's degree from San Francisco State University in 1976, with a thesis titled "The Boletaceae of the Sierra Nevada", under the supervision of Harry Delbert Thie