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a group of Basidiomycetes. The fruit bodies have a spore-forming layer (hymenium) composed of undivided spore-forming basidia and sterile formations such as cystides. The hymenium is usually located right on the surface of the fruit body, but sometimes it is initially covered with a filmlike or fibrous cover and then exposed when the spores mature. Sometimes the group is divided into five families: Thelephoraceae, Clavariaceae, Polyporaceae, Agaricaceae, and Hydnaceae. These include most edible and poisonous fungi. Many taxonomists do not recognize such a division and subdivide these fungi in other ways.
(also Macromycetes), a group of higher fungi that usually have large fleshy fruiting bodies most often consisting of a cap and stalk. Most belong to the class Basidiomycetes (for example, Boletus edulis, Snillus luteus, Lactarius piperaius, Russula vesca, Armillariella mellea, and Amonita muscaria). Some belong to the class Ascomycetes (for example, Morchella esculenta, Gyromitra esculenta, and Tuber melanosporum). Sometimes only basidiomycetous mushrooms of the order Agaricales are referred to as Hymenomycetes.