Observation 131286: Amanita muscaria subsp. flavivolvata Singer

When: 2012-07-04

Collection location: Near Hay River, Northwest Territories, Canada [Click for map]

Who: Dr. Suzanne Carriere (CarriereS)

No specimen available

photo by Gene Hachey



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There’s another interesting thing about this posting.
By: R. E. Tulloss (ret)
2013-06-25 09:26:24 CDT (-0400)

It was collected outside the confirmed range of both of the names that have been offered for it. I see there was no herbarium specimen. If similar material from the Northwest Territories were able to be dried (even a thin pie shaped piece of a cap) thoroughly (and neither burned nor cooked in the process), either morphological or extraction of the “proposed fungal barcode” gene could settle the question of the identity of this critter.

I would be glad to look at such material as would Dr. Jozsef Geml (Univ. of Leiden, Netherlands) who is continuing to genetically “monitor” collections of muscarioid taxa from the Americas.

Very best,


Christian has a good hypothesis.
By: R. E. Tulloss (ret)
2013-06-25 09:19:00 CDT (-0400)

I think there are other factors that are involved, also…because species of section Vaginatae with no volval material left on the cap at all also show this “malleata” or “hammered” appearance of the cap. Infamously, there is a species called Amanita malleata in the group of Vaginatae with broadly ellipsoid spores and weakly structure volval sacs. This species occasionally is seen with the hammered appearance to the cap. I think it is related to tissue collapse under the cap’s skin…possibly due to the larvae of fungus gnats or other insects that lay eggs on or into the cap surface.

So far as I know, detailed examination of multiple examples of hammered caps on Amanita have not been carried out.

My main email service provider seems to be in a hard crash this a.m. So I probably won’t see response to MO postings for awhile.

Very best,


This happens sometimes
By: Christian (Christian Schwarz)
2013-06-25 01:00:29 CDT (-0400)

I’m sure Rod can give a better explanation, but as far as I can tell, the UV patches act as physical barrier against sunlight degradation and water leaching of the red pigments, and as the warts dehydrate and shrink, they leave sunken, pigmented pits in the cap

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By: Martin Livezey (MLivezey)
2013-06-24 20:00:38 CDT (-0400)

on the unusual color of the cap in the first photo! Is this due to rain, sunshine, a combination of the two – or is it natural?

Created: 2013-04-04 12:19:35 CDT (-0400)
Last modified: 2013-06-24 19:31:29 CDT (-0400)
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