This section is from the book "Studies of American Fungi: Mushrooms, Edible, Poisonous, Etc.", by George Francis Atkinson. Also available from Amazon: Studies of American Fungi: Mushrooms, Edible, Poisonous, Etc..
The spores are black in mass, not purple tinged. For analytical keys to the genera see Chapter XXII (Chemistry And Toxicology Of Mushrooms).
 
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