This single mushroom was found in a mixed conifer forest within 10 ft of a small group of B. edulis. In the crossection there is little pigment. When first cut there was the slightest hint of yellow at the very apex of the cap. When later checked, I could see no color. The photos were taken directly after cutting. Because of the color, such as it was, I did not call it A. muscaria var. alba.
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That possibility is that you triggered a staining reaction when you cut the very fresh specimen; but when the specimen aged, somehow the effect was not the same.
I guess we can’t sort this out with photographs. Nevertheless, it is interesting that the photographs raised our awareness of multiple possible explanations of what you saw.
my previous comment, I said that no pigment was visible after the new cut, as though I knew exactly what to look for. Let me change that to say that my eyes don’t notice pigment, but understand that well trained eyes might.
faded, or disappeared in time, and that there is no image of that, I made another cut, perpendicular to the first in an attempt to re-create the circumstances. My assumtion was that pigment would be visible immediately after making the cut, and it would be possible to make a photo record of it fading.
In fact, no pigment was visible after the new cut. A variable in this would be that the specimen is partially dry at this point, but the context within remains moist.
I think that I see the warts as being yellow in cross-section. Given the geography and the molecular study for Dr. Geml et al., that doesn’t determine a species but it makes muscaria subsp. flavivolvata (some day to be named “amerimuscaria”) as likely a determination as muscaria subsp. muscaria. It is interesting to hear that the pigments were faded by exposure to light in both the warts and the developing pileipellis.
Created: 2012-08-28 00:27:01 PDT (-0700)
Last modified: 2012-08-28 15:58:30 PDT (-0700)
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