by Michael W. Beug Email: beugm@evergreen.edu
The Evergreen State College, Olympia WA
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Slide 4.
Amanita bisporigera, shown here, is one of several highly similar pure white deadly Amanitas common in many parts of the U.S. When they first appear they are completely enclosed by a thick universal veil so that they look much like an egg and can be mistaken for a puffball. However slicing them vertically through the center will reveal the developing stem and gills. The thick universal veil remnant leaves a characteristic sac-like cup at the base of the stem of mature specimens. This death cup may be buried and missed by careless collectors who cut the stem off near ground level. Then the mushrooms can be easily mistaken for one of many other pure white gilled mushrooms, especially Lepiota naucina.
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