I would have taken better volva photos had I known the importance in distinguishing this from A. constricta. Growing under oak.
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The species is quite dark colored, and is quite elegant. Even small specimens will often have a notably elongate stem (although thinner than normal). The volval sac is proportionately quite large and is quite thick. In these characters (color aside) it is most similar to European taxa such as A. pachyvolvata and A. magnivolvata and to the eastern U.S. species A. violettae. None of these species are terribly common in their home regions.
Take a look at information about the size of the stem versus the width of the cap and the size of the volva.
Created: 2014-11-27 12:53:22 PST (-0800)
Last modified: 2014-11-27 13:14:49 PST (-0800)
Viewed: 26 times, last viewed: 2017-06-19 07:37:08 PDT (-0700)