Description: English: The thick-walled maze polypore, Daedalea quercina, growing on oak. Photographed in the United States. Date: 18 August 2006. Source: USDA Forest Service, : This image is Image Number 1301064 at Forestry Images, a source for forest health, natural resources and silviculture images operated by The Bugwood Network at the University of Georgia and the USDA Forest Service.. Author: Joseph O'Brien.