This mushroom species complex is in the Boletes/Boletaceae Family. They have sponge-like tubes under the cap, are medium to large in size with a cap and central stalk. The tubes can pull away relatively easily and are lined with basidia from which spores drop down exiting into the air. Boletus edulis is arguably the most famous species complex in the group. Also known as the King Bolete or Porchini, it has a convex cap with a highly variable colour: brown, yellow-brown, cinnamon, reddish brown or even red, with white or pink tints. Common in western North America, it can be found solitarily or in groups under conifers or hardwoods such as birch or oak trees.