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Amanita abrupta
http://www.ilmyco.gen.chicago.il.us/Taxa/Amaniabrup518.html
Scroll down for illustration.
Amanita abrupta (MushroomExpert.Com)
http://www.bluewillowpages.com/mushroomexpert/amanita_abrupta.html
Brief description and images.
Amanita abrupta Peck
http://pluto.njcc.com/~ret/amanita/species/abrupta.html
Brief description and color and b/w illustrations.