Observation 189471: Amanita sect. Amidella

When: 2014-09-07

Collection location: Michigan City, Indiana, USA [Click for map]

Who: katwerner89

Specimen available

Habitat- sandy soil, oak and pine woods
Spore print- Creamy white
Spores- 10.79-14.11×3.32-4.98
Pileus- 6.0 cm
Stipe- 8.0×1.8 cm

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Hello, Kat.
By: R. E. Tulloss (ret)
2015-01-09 13:03:32 EST (-0500)

If you should find some more of this species, look for a button or a very young and incompletely expanded fruiting body a little bigger than a button. Amanita peckiana is distinguished by having a membranous partial veil very early in its development. This was mentioned by Kauffman in his original description of the species. When I saw the type in the NY State Museum (Albany) years ago, there was still a partial veil on one of the young specimens. And there was a note from Kauffman to Peck pointing out that he had been sure to send Peck and specimen with the partial veil in place. It’s cool when you find old documents related to the old specimens…especially in the cases of type collections.

Very best,


The spores are much too narrow and too large for pseudovolvata. EDITed
By: R. E. Tulloss (ret)
2014-12-31 21:59:18 EST (-0500)

The spores you measured are much more like the spores in the “cylindric” range of species such as A. peckiana.

Amanita peckiana apparently has a wide range but was originally described from Michigan. It is plausible for it to be found in your area especially in sandy soil with some pines and, especially, oaks present.


I have become concerned over whether there are taxa of section Amidella in North America that are unnamed and are confused with peckiana…another thing to sort out. In preparation for a resorting I stripped down the techtab of the above web page to just the type collection and one other one.

Very best,


Very best,


At the present moment in time, …
By: R. E. Tulloss (ret)
2014-11-25 13:45:51 EST (-0500)

I don’t think a DNA sequence will help you too much in terms of getting to an ID.

There are several older sequences from eastern Asia that are called “A. volvata” but represent E. Asian taxa, probably either A. clariquamosa or A. avellaneosquamosa. In fact, the majority of the “volvata” sequences in GenBank are from east Asian sources and can’t be A. volvata. (I just downloaded the sequences from GenBank labeled “Amanita volvata.”)

AF024485 is a small nrLSU segment from material I determined as A. volvata. That work dates back to the mid-1990s. The name “A. volvata” is very commonly misapplied all over the world…including in North America. I am sure that your sequence will be a “close” match to other sequences in section Amidella, but it’s not too likely to match a sequence called “A. volvata.”

If you go to


and check a few of the species’ technical tabs, you will find a few with GenBank sequences that are thought by me to be based on reliably determined material in a data field called “GenBank nos.” which is near the top of the technical tab.

The one sequence from volvata that is mentioned above is downloadable from this data field on the volvata page.  Other pages with links to “reliable” sequences include those for the following species:

avellaneosquamosa, clarisquamosa, proxima, whetstoneae, and sp-Arora-01-560. Of these species volvata and whetstoneae are the North American ones. There must be at least a half-dozen other amanitas in sect. Amidella from North America. You’re walking into a dimly lit room. That should be interesting! A lot that needs to be learned.

Good luck!

Very best,


By: katwerner89
2014-11-25 11:19:45 EST (-0500)

Hi Rob!

I would be happy to hand it over to you. Unfortunately, I need it for class. My final project and all specimens are due on Dec 12th. We our sequencing the DNA and hopefully (if it actually turns out), then it might give me a more positive identification. However, thank you very much for your input. I was not very confident it was an amanita at all. So this really helps!

This certainly belongs in Amanita sect. Amidella.
By: R. E. Tulloss (ret)
2014-11-25 10:48:35 EST (-0500)

I usually identify volvata by the large amount of flocculent material at the top of the stipe, the size of the fruiting body, the spores, and the structure of the lamella trama.

I think that there are more species in section Amidella in eastern North America than I thought there were back when I started out trying to learn that section. Conveniently, A.whetstoneae” has turned out to be distinctive morphologically and genetically. However, the same cannot be said for other taxa in the group.

You came upon this critter too late in its life to see the flocculence.

If you would be so kind, I would be glad to take a look at this material. Our queue is long enough that it will require patience on your part.

Very best,


Created: 2014-11-25 02:24:18 EST (-0500)
Last modified: 2015-01-09 12:38:35 EST (-0500)
Viewed: 97 times, last viewed: 2017-09-01 01:24:40 EDT (-0400)
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