macowanites americanus

from WordNet (r) 3.0 (2006)

Macowanites americanus
    n 1: a small fungus with a fragile cap that cracks to expose the
         white context and a white stalk that is practically
         enclosed by the cap

from The Collaborative International Dictionary of English v.0.48

Macowanites americanus \Macowanites americanus\, prop. n.
   A small fungus with a fragile cap that cracks to expose the
   white context and a white stalk that is practically enclosed
   by the cap.
   [WordNet 1.5]

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