Observation 189853: Amanita pachycolea D.E. Stuntz

When: 2014-11-26

Collection location: Moss Cove rest area, Mendocino Co, California, USA [Click for map]

Who: Jocelyn Gwynn (joceyg)

No specimen available

I would have taken better volva photos had I known the importance in distinguishing this from A. constricta. Growing under oak.

Proposed Names

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Eye3 Eyes3
Recognized by sight: Dark grey-brown cap with thick white patch of veil remnant, radial striations toward cap margin, volva present, annulus absent

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Eye3 = Observer’s choice
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There seems to be a little confusion about pachycolea on MO over recent weeks.
By: R. E. Tulloss (ret)
2014-11-27 13:21:11 PST (-0800)

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.

Very best,


Created: 2014-11-27 12:53:22 PST (-0800)
Last modified: 2014-11-27 13:14:49 PST (-0800)
Viewed: 27 times, last viewed: 2018-03-26 13:35:13 PDT (-0700)
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