Polypores are a group of tough, leathery poroid mushrooms similar to boletes, but typically lacking a distinct stalk. The technical distinction between the two types of mushrooms is that polypores do not have the spore-bearing tissue continuous along the entire underside of the mushroom. Many polypores are bracket fungi. The polypore growth form exists in many different evolutionary lines of higher basidiomycetes. Edmund Michael (born 1849 , m. 1920 ) was a German mycologist. He studied agronomy in Leipzig , and will be a teacher at the Agricultural Academy of Auerbach ", in 1884. His major contribution was the publication of a " Field Guide Führer für Pilzfreunde "