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This is a cup mushroom (Agaricus bisporus) bought at the local supermarket. It was about 7cm across. It was interesting in that it had a "Siamese twin"! This phenomenon seems rather common among these mushrooms.
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue
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