Proposed Names

77% (2)
Recognized by sight: The same location as obs 13790
82% (1)
Based on chemical features: Combined nrITS-LSU matches sequences reported from type and other collections of betulae.

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= Observer’s choice
= Current consensus


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The breakthrough created by type sequencing (Hanss & Moreau 2020)…
By: R. E. Tulloss (ret)
2020-07-14 07:32:09 EDT (-0400)

continues to have a positive impact on determination in the Roosevelt herbarium. These illustrations will now allow us to illustrate A. betulae on the WAO website. Soon.

Thanks again with this wonderful collection. Association with Birches and Willows is an important field chracter for this species.

Very best,


so what’s going on…
By: Debbie Viess (amanitarita)
2010-10-30 12:33:47 EDT (-0400)

with that ring of extra volval material in the bottom couple of photos?

and how ’bout a photo of that newly famous plastic box? ;)

My impression
By: Irene Andersson (irenea)
2010-10-30 10:13:30 EDT (-0400)

is that they grow with birch, but several Salix species are also present at the location.

Thanks for the correction!
By: R. E. Tulloss (ret)
2010-10-29 08:52:13 EDT (-0400)

Are these non-dwarf Salix mycorrhizal?

Yesterday, Mary took a sandwich for lunch to work with her in the box that your limacellas came in. She reports the box behaved well. There were no signs of its rejecting nonmycological contents. :-)

Thank you for information, specimens, and boxes.

Very best,


It’s not an alpine habitat
By: Irene Andersson (irenea)
2010-10-29 04:56:21 EDT (-0400)

No kinds of dwarf Salix, mostly what I beleive is S. myrsinifolia, phylicifolia, caprea, borealis (and probably several hybrids, at least too hard for me to ID..), the common Betula pubescens, and Juniperus communis. Amanita fulva is common at this spot too.

Strange that you don’t find these plastic boxes. They are meant to be used for food in the freezer, and we can buy them in almost every grocery store.
But you don’t need to, if I keep sending collections in them :-)

I’m not sure why I didn’t notice the material was from Lapland.
By: R. E. Tulloss (ret)
2010-10-28 15:01:18 EDT (-0400)

I see from your note with the specimen that it occured with miniature(?) Salix and Betula. For these reasons, I think it is important to consider the possibility that it is A. mortenii or A. groenlandica. We will see what comes of all this.


Material received in good order.
By: R. E. Tulloss (ret)
2010-10-28 14:55:12 EDT (-0400)


The material from this observation has been received in good order, in NJ, in one of your remarkable Finnish packing boxes. I fail to understand why we can’t find such objects easily in the U.S.

Perhaps, they are all imported to New York and snatched up by the knowledgeable populace there.

Thank you for the specimen.

Very best,


Thanks, ret
By: Irene Andersson (irenea)
2009-11-10 10:31:41 EST (-0500)

I was really glad to find it at the same location again! Then I was able to confirm the earlier obs from the same location (with just one poor photo).

good photographs, Irene.
By: R. E. Tulloss (ret)
2009-11-09 13:53:17 EST (-0500)

This materials seems very like the material I have seen in photographs from Norway and France; and the volva is certainly what should be expected in the A. submembranaceae group. The fact that mature material still appears olivaceous (or grayish yellow in some books) probably serves to distinguish the collection (as much as possible in a photograph) from Amanita mortenii, which begins olivaceous be comes an orangish (cardboard) brown.

Thanks for posting the interest pictures, expecially the details of the graying and collapsing volval sac.