am·a·ni·ta 
(ăm′ə-nītə, -nē-)
(ăm′ə-nītə, -nē-)n.
Any of various mushrooms in the genus Amanita, many of which are extremely poisonous. Amanitas have white spores and usually a ring around the stalk and a rounded bulb at the base.
[New Latin Amānīta, genus name, from Greek amānītai, a fungus.]