Observation 120422: Amanita muscaria var. guessowii Veselý

When: 2005-09-10

Collection location: Vermont, USA [Click for map]

Who: Modified Hypothesis (Modified Hypothesis )

No specimen available



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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Yes, that’s right. And that’s the answer to your question.
By: R. E. Tulloss (ret)
2013-11-29 20:10:42 EST (-0500)

I don’t know of any successful mating studies of ectomycorrhizal amanitas. Since, the free-living (saprobic) amanitas have been grown from spores in culture, I suppose that mating studies could be done for things like Amanita thiersii. If somebody tries it, I hope I hear about it.


By: Erlon (Herbert Baker)
2013-11-29 17:54:40 EST (-0500)

I see nothing about mating studies there.

If you’re looking for species that have not yet been differentiated by eye and/or microscope,…
By: R. E. Tulloss (ret)
2013-11-29 17:49:02 EST (-0500)

It seems that there are more than enough to keep folks busy for awhile.

If you’re looking for things that look different, but are genetically pretty much the same, that’s another story…and it depends whose field guide you use and who did the past morphological work ups. There is good work and careless work.

Very best,


By: Modified Hypothesis (Modified Hypothesis )
2013-11-29 15:19:22 EST (-0500)


Hmm its really odd to see persicina that north.

Hey Tulloss , if i move back to the east coast I guess I will try to take better documentation, I would love to discover when of these other distinct difference species that look really similar lol

Here are the references for Dr. Geml’s work.
By: R. E. Tulloss (ret)
2013-11-29 13:41:37 EST (-0500)

Geml, J., G. A. Laursen, K. O’Neill, H. C. Nusbaum and D. L. Taylor. 2006. Beringian origins and cryptic speciation events in the fly agaric (Amanita muscaria). Mol. Ecol. 15: 225-239.

Geml, J., R. E. Tulloss, G. A. Laursen, N. A. Sazanova and D. L. Taylor. 2008. Evidence for strong inter- and intracontinental phylogeographic structure in Amanita muscaria, a wind-dispersed ectomycorrhizal basidiomycete. Molec. Phylog. Evol. 48: 694-701. [ This can be downloaded from the bibliography at: http://www.amanitaceae.org?bibliography ]

Geml, J., R. E. Tulloss, G. A. Laursen, N. A. Sazanova and D. L. Taylor. 2010. Phylogeographic analyses of a boreal-temperate ectomycorrhizal basidiomycete, Amanita muscaria, suggest forest refugia in Alaska during the last glacial maximum. in Habel, J. C. and R. Assman, eds. Relict species. Phylogeography and conservation biology: 173-186.

By: Erlon (Herbert Baker)
2013-11-29 13:03:26 EST (-0500)

How did you perform mating studies with the east in west collections? Are basing this on purely DNA evidence? You also say it can mate with red capped varieties to the south? Care to take that back?

So whats your opinion
By: Modified Hypothesis (Modified Hypothesis )
2013-06-29 19:24:50 EDT (-0400)

On the red one verse those yellow. would you consider them different sub species they feel pretty different

Now that
By: Josh M.K. (suchen)
2012-12-19 16:20:47 EST (-0500)

will be a glorious day! Do you have any more information about the island you speak of?

The current working hypothesis…
By: R. E. Tulloss (ret)
2012-12-18 23:10:26 EST (-0500)

after a fairly large genetic and morphological review of muscaria-like taxa in North America came to this:

1. The red subsp. flavivolvata in the west of the contiguous 48 U.S. states and western Canada and southern Alaska and Mexico and Central America is apparently an independent species from the red (true) muscaria of Europe and Asia.

2. The yellow-orange-red var. guessowii of the north central and north east of the U.S. and much of eastern Canada is the same species, but a yellow color variant. It is not a distinct variety. It’s a cluster of yellow capped, possibly separately evolvated populations that still can “mate” with each other and the red-capped variant to the west and south.

3. There are at least three or four other very muscaria-like species in North America. One is presently called Amanita muscaria var. persicina; the others are all clustered on an island off the coast of Santa Barbara Co., Calif. and are poorly known except for some DNA sequences.

I hope this helps.

We hope to get some of the necessary morphological data published with at least the name “A. amerimuscaria” within the next year or so.


Created: 2012-12-18 18:13:13 EST (-0500)
Last modified: 2015-05-30 12:59:50 EDT (-0400)
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