Observation 79027: Amanita constricta Thiers & Ammirati

When: 2011-10-08

Collection location: Darrington, Snohomish Co., Washington, USA [Click for map]

Who: Tim Sage (NMNR)

No specimen available

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Proposed Names

19% (2)
Recognized by sight
57% (1)
Recognized by sight: ID’d as such by SCMS

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Add Comment
that constricted volva is one give-away…
By: Debbie Viess (amanitarita)
2011-10-09 11:02:09 PDT (-0700)

although both species share a number of characters in common: reddening volvas (as Darv mentioned), sometimes ornamented stipes, marginate gills and zonate caps.
Constricta also often has gray staining on the inside of the volva sac, although I don’t see that character here.

Pachycolea is generally more robust over-all, with a much thicker UV. But there are definite examples of medium sized Western grisettes that do not fit neatly into either category. Go figure.

By: Darvin DeShazer (darv)
2011-10-09 08:23:38 PDT (-0700)

Both of the fruit bodies appear to be A. constricta. It can get reddish stains on the volva in age, especially when wet, and the cap colors range from gray to brown often with concentric rings of darker and lighter colors. Also the tall, skinny stature resulting in a fragile mushroom is typical for this species.

There might be more than one species here…
By: R. E. Tulloss (ret)
2011-10-09 04:06:00 PDT (-0700)

The very big guy with the zonate pileus could be A. pachycolea.

The partially expanded sample with the upper part of the universal veil flaring and separated from the lower part of the volval sac seems like something that has a less robust volva than does A. pachyvolvata…maybe A. constricta.


http://www.amanitaceae.org/?Amanita constricta

Very best,


Created: 2011-10-08 22:57:56 PDT (-0700)
Last modified: 2011-10-09 13:20:11 PDT (-0700)
Viewed: 93 times, last viewed: 2019-02-17 11:23:28 PST (-0800)
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