Observation 26412: Amanita amerimuscaria Tulloss & Geml nom. prov.

When: 2009-10-03

Collection location: Luzerne Co., Pennsylvania, USA [Click for map]

Who: Dave in NE PA

Specimen available

These pale colored ones were mixed in with the more typical yellow variety. There were plenty of each type growing nin close proximity to one another. As I understand it, the color variants for eastern NA muscaria types do not constitute individual species status. It’s interesting that distinctly different color varieties occur very close to one another. Lawn nearby Norway Spruce.


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Add Comment
By: Erlon (Herbert Baker)
2014-04-26 19:33:20 PDT (-0700)

It appears there are two white forms of A. chrysoblema in the east. One that is a true albino?, and one that is created due to loss of pigment by environmental factors.

That’s a really interesting hypothesis, Herb.
By: Dave W (Dave W)
2014-04-26 10:42:18 PDT (-0700)

Here’s an obs made from the same location during the same time period. Within the notes is an explanation about the co-mingling of yellow ones with the pale ones.

Hi Dave
By: Erlon (Herbert Baker)
2014-04-26 09:04:26 PDT (-0700)

I think they are the same species, according to recent DNA work.
“This entity may have to be treated as a morphological (white) variant of Amanita muscaria var. flavivolvata. In which case, the present name would take precedence at the rank of species." Rod Tulloss


Herb, do you think the more colorful…
By: Dave W (Dave W)
2014-04-25 22:02:18 PDT (-0700)

examples that grow along with these may be the same species? What characters separate A. chrysoblema from var, guessowii?

By: Erlon (Herbert Baker)
2014-04-25 18:49:07 PDT (-0700)

A. chrysoblema is polymorphic.

Thanks David,
By: groundhog
2014-04-25 13:53:17 PDT (-0700)

This material has been accessioned to Rod’s herbarium.

I have my doubts about this…
By: Dave W (Dave W)
2014-01-29 05:45:50 PST (-0800)

collection representing the true eastern NA white muscaria. The particular location where I find these typically offers yellow, orange, and almost white ones growing together. It’s an open area that gets plenty of sun, and in the fall, when this collection was made, this is one of the first places in my area to get frost. So I suspect that weather conditions influence the cap color.

Rod, do you think it would be useful for me to make collections from this spot? This past year was very dry, and the autumn Amanitas were scarce.

Hi Herb.
By: Dave W (Dave W)
2013-11-18 05:32:54 PST (-0800)

Thanks for updating some of my old muscaria obses. The site where these were collected annually feature yellow, orange, and the very pale types seen here. For the time being, it seems reasonable to lump these under the heading
var. guessowii." Other similar obses made under name Dave W will likely show the location as Bear Creek, which specifies the location where these were collected.

By: Erlon (Herbert Baker)
2009-10-09 20:25:43 PDT (-0700)
..sun bleached specimen of Amanita amerimuscaria, this is an example of the legendary “silver fly-agaric”, supposedly more potent then its yellow counterpart. There may be something to this legend, ibotenic acid is converted into the more psychoactive muscimol by UV rays and naturally through the drying process.
Good initiative
By: R. E. Tulloss (ret)
2009-10-09 14:50:46 PDT (-0700)

If you can get yellow and white from a single site, then I will do my best to have the samples get to Dr. Geml.

Very best,


There does appear to be a bit of yellow
By: Dave in NE PA
2009-10-09 14:31:21 PDT (-0700)

or orange pigment in these caps. But the difference between these and the nearby yellows was quite dramatic. There had been little rainfall during the previous several days, and many of the Amanitas (including some of each color) grew out in the open with only spruce in the general vicinity. It could very well have been that the white ones were a few days older than the yellows, and that a shower had affected the former. I really should have got some yellows for a paired sample. My guess is that some of each will again become available next week.

disappearing yellow…
By: R. E. Tulloss (ret)
2009-10-09 10:50:34 PDT (-0700)

All the times I have found a white specimen of A. amerimuscaria I have discovered that it has been through a good heavy rain and the buttons near it were all yellow-capped. I think that MANY collections of white amerimuscaria have had their yellow pigment washed away. Also, if leaves stick to the top of a yellow amerimuscaria, sometimes pigment does not develop in the “shade” of the attached leaf. Low or no exposure to sun apparently can prevent the development or permanence of the yellow pigment.

Very best,


Created: 2009-10-08 17:53:49 PDT (-0700)
Last modified: 2018-01-04 09:42:57 PST (-0800)
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