Boletus Zelleri is a species of mushroom that is commonly found in North America. It is also known by several other names such as the butter bolete, the yellow-cracked bolete, and the smooth cap bolete. The mushroom is characterized by its smooth cap, which ranges in color from yellow to brown, and its thick stem, which is often covered in a net-like pattern. Other synonyms for Boletus Zelleri include Boletus subappendiculatus, Boletus integrellus and Boletus innixus. The mushroom is prized for its meaty texture, nutty flavor, and high nutritional value, making it a popular choice among both amateur and professional chefs.