Observation 25916: Amanita muscaria var. guessowii Veselý

When: 2009-09-27

Collection location: Gifford Pinchot State Park, York Co., Pennsylvania, USA [Click for map]

Who: kate (kate)

No specimen available

Several of these Amanita’s were found growing under a large Arborvitae near a parking area at Pichot park. There were other species growing in close poximity as well as rows of White pines which line the entire parking area. These were growing on the East side of the tree. The caps of the smaller mushrooms were lemon yellow with tinge of faint red in the center of the cap very faint. I made a spore print sample of smallest mushroom, the results of the spore print produce a white transfer.

[admin – Sat Aug 14 02:00:41 +0000 2010]: Changed location name from ‘Gifford Pinchot State Park, YORK COUNTY, PENNSYLVANIA’ to ‘Gifford Pinchot State Park, York Co., Pennsylvania, USA



Proposed Names

28% (2)
Recognized by sight
84% (1)
Recognized by sight: washed out/bleached

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
very common this year
By: Eddee (eddeeee)
2009-09-29 00:12:30 CDT (-0400)

Amanita amerimuscaria is very common this year. Last year only found a dozen this year there have been 100s/ All under various pine trees. This was once named Amanita muscaria Var. formosa but for what ever reason they changed it.

Pigment probably a little washed out by rains…
By: R. E. Tulloss (ret)
2009-09-29 00:05:56 CDT (-0400)

Sunlight can alter colors significantly as can drying. Sunlight with low humidity at high altitude works a number on pigments rather quickly. The pigments of amanitas can be internal to cells (mostly or entirely long hyphal threads in the skin of the cap) or be interspersed among the cells (less likely). It is my impression that rain soaking an expanding/expanded mushroom increases the gelatinization of the Amanita cap…making it more slippery and washing away the warts. The breakdown of the cells of the cap skin would release the pigment (which would wash away) making the cap paler. This could be tested by repeatedly measuring the thickness of the cap skin under a microscope during a dry day and during a rainstorm. Interesting thought. I had been happy with the above hypothesis, but it could/should be subjected to experimentation. Nice project for some microscopist.


Heavy rains the night before I observed these mushrooms.
By: kate (kate)
2009-09-28 23:38:06 CDT (-0400)

We had heavy rain the night before I took these images. I noted that the mushrooms that were closer to the center of the tree had a more pronounced coloration as well as more warts. Is the pigment superficial? Will other elements cause the color to fade?

Pigment probably a little washed out by rains…
By: R. E. Tulloss (ret)
2009-09-28 23:19:11 CDT (-0400)

Yellow variant.


Created: 2009-09-28 23:09:18 CDT (-0400)
Last modified: 2011-03-19 16:50:27 CST (-0500)
Viewed: 99 times, last viewed: 2017-08-11 18:24:48 CDT (-0400)
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