Aspects of this topic are discussed in the following places at Britannica.
...early summer in woods. The bell morel (Verpa), an edible mushroom with a bell-shaped cap, is found in woods and in old orchards in early spring. Most species of Gyromitra, a genus of false morels, are poisonous. G. brunnea is edible, however, and is found in sandy soils or woods.
...(family Lycoperdaceae; q.v.), stinkhorns (q.v.), earthstars (a kind of puffball), and bird’s nest fungi are usually treated with the mushrooms. The morels (Morchella, Verpa) and false morels or lorchels (Gyromitra, Helvella) of the phylum Ascomycota (q.v.) are popularly included with the true mushrooms because of their shape and fleshy structure; they resemble...
...fungi in which no sexual reproductive stages are known). The large toxic mushrooms, or toadstools, are mostly members of the class Basidiomycetes, although some Ascomycetes, such as the poisonous false morel (Gyromitra esculenta), may attain a size as large as some of the mushrooms.
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