Voucher Number: NAMA 2014-070 ; Amanita muscaria var. formosa Pers.; Identified by: Daniel Miller ; Collected by: L. K. Yamada ; Voucher Specimens are located at the Botany Herbarium, Field Museum of Natural History, Chicago.

Species Lists


Proposed Names

16% (2)
Recognized by sight
-4% (2)
Recognized by sight: yellow form
Used references: Amanita of the PNW, Jan Lindgren; other examples of PNW yellow morphs with yellow UV.

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has the DNA been run on this collection?
By: Debbie Viess (amanitarita)
2018-06-17 11:02:09 PDT (-0700)

I remember seeing it in the lab during that NAMA foray.
Haven’t we gotten funding to preferentially run some of this NAMA amanita DNA?

If so, where are those results, or if not, what is our progress on this project?

Thanks Rod and Herbert!
By: North American Mycological Association (NAMA)
2015-03-28 14:31:42 PDT (-0700)

Martin Livezey for NAMA

I think that this should be called A. muscaria var. formosa sensu Thiers or…
By: R. E. Tulloss (ret)
2015-03-28 14:00:11 PDT (-0700)

sensu “Pacific NW authors”.

From the studies of Geml (2008), we learned that the yellow and tannish muscarioid specimens of the British Columbia, Oregon, and Washington (and surrounding areas) were color variants of the Eurasian species Amanita muscaria. Studies continuing up to the present by Dr. Geml with support from the Roosevelt, NJ group have not revealed anything different concerning the various colors of the true (Eurasian) A. muscaria and the dominant North American “muscarioid taxon” (to which a number of names apply to different color variants as has been discussed many times on mushroomobserver).

In order to resolve the naming of the dominant North American “muscarioid taxon,” I am still seeking white muscarioid taxa from the middle of the North American continent to the Atlantic Ocean (this request applies to Canada and the northern “half” of the U.S.). We ask particularly that the caps of such a collection be cut in half. We are only interested in material that show NO YELLOW, ORANGE or RED in a cross-section of the skin of the cap. In other words, we seek material that is entirely white in a cross section of the cap. Yellow staining of the stipe flesh is OK and should be reported if it occurs in material that is sent to us.

If you have material that you would like to contribute and that meets the above requirements. Please send it to this address:

Herbarium Amanitarum Rooseveltensis
P. O. Box 57
Roosevelt, NJ 08555-0057

So far, the very small number of collections received have produced DNA consistent with the yellow- or orange- or red-colored taxa of the dominant North American “muscarioid taxon.”

To cover the range in which a search is needed, we have to rely on collectors such as the participants on

The reason for the search is the need to make a good faith effort to see if we can detect two or more, genetically distinct, white muscarioid entities in the geographic region of interest.

Thanks in advance.

Very best,

Rod Tulloss