Observation 79375: Amanita sturgeonii Tulloss, Q. Cai and L.V. Kudzma nom. prov.



Proposed Names

82% (1)
Recognized by sight: In RET’s herbarium, the voucher for this observation has accession number 493-6. This collection has been sequenced for the 28S rDNA gene in Dr. Zhu L. Yang’s laboratory (Kunming, Yunnan Prov., China). A digest of results shared with RET indicates that Walt’s robust material from Ohio is probably distinct from A. bisporigera and may be a new taxon. Hence, I am introducing the old code name for Walt’s collections as a moniker that can be used temporarily for this mushroom. Apparently, its range extends beyond Ohio. From the initial molecular evidence, the present entity may be the cause of deadly poisoning in New Jersey that was attributed by me to A. bisporigera.
Based on chemical features: See above note.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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This collection has been sequenced by Q. Cai et al.
By: R. E. Tulloss (ret)
2014-07-09 11:53:35 CDT (-0400)

This established a number of examples of the sequences for five genes of this species.



Thanks again, Walt, for providing me with collections of this species.

Very best,


A combination of data from Walt and from examination of Walt’s specimens is…
By: R. E. Tulloss (ret)
2012-09-19 16:07:59 CDT (-0400)

beginning to be posted here:



Thanks, again, Walt.
By: R. E. Tulloss (ret)
2011-10-13 21:12:45 CDT (-0400)


KOH reaction
By: walt sturgeon (Mycowalt)
2011-10-13 20:12:23 CDT (-0400)

As I remember the cuticle turned yellow in KOH but that was a long time ago. Also I recall that someone did a meixner test which was positive for toxins.
Sometimes the pileus can have olivaceous stains. AH Smith called it A. phalloides which it obviously is not.

Thanks for the info, Walt.
By: R. E. Tulloss (ret)
2011-10-13 18:44:50 CDT (-0400)

I thought that this might be the robust amanita that you first sent me from a cemetery (Forest Lawn Memorial Pk., Youngstown) many years ago. I have four collections of this critter in the herbarium.

My notes on that collection indicate that its spores were similar to those of Amanita bisporigera. The form of the fruiting body, however, is more squat and robust. It has a code number (O1…that’s “O” as in “Ohio”), but it’s not yet made it onto WAO. I have the opportunity to send this for DNA sequencing at the moment; and I will send samples from all material (including this one) that you’ve sent. In China, Dr. Yang is finding that there are multiple white-capped taxa in the Phalloideae that look very much alike. Once they were found to be different on molecular grounds, morphological differences were also found..

Of course, it’s quite possible that we have a similar situation…that is to say we could have more species in the globose-spored Destroying Angel group than we think we have.

Debbie, the brown staining from handling is something that Walt noted in his comments on past collections of what apppears to be the same species. Also the fragility of the partial view is something previously recorded for this mushroom.

I’ll certainly let you know what we find out. In my composite of notes (yours and mine), I have written “sometimes yellow” with KOH. Can you give me any clarification on the word “sometimes” in this context?

Very best,


love child between section amidella and phalloides???
By: Debbie Viess (amanitarita)
2011-10-13 13:31:06 CDT (-0400)

I must admit at first glance I also thought section phalloides, and this one even reminded me a bit of our western Destroying Angel, Amanita ocreata…but then I looked at that odd volva and its staining and thought that Walt was maybe seeing something in hand that I can’t see here at home. So, what made YOU say section Amidella, Walt?

I will be curious to hear what you come up with in your analysis of the fruit bodies, Rod (and Christina).

By: walt sturgeon (Mycowalt)
2011-10-13 12:18:44 CDT (-0400)

Any information is appreciated. No notes with this collection but it is the same species I sent you previously with notes. I have seen it from 5 sites always in lawns and with red oak present.

Maybe this should be placed in sect. Phalloideae
By: R. E. Tulloss (ret)
2011-10-13 12:11:28 CDT (-0400)

The stems on the button become broader as they approach the apparent bulb. The stems in sect. Amidella are typically totally elongating. Likewise the apparent bulb (splitting on at least one of the button specimens) seems to be joined with the stem (white flesh is exposed in the split). In sect. Amidella the apparent “bulb” is usually quite clearly a very thick volval sac rather than a bulb. Thirdly, there is an annulus on the stem on the left and shreaded over the gills on the specimen for which the underside of the cap is visible. The only North American species of sect. Amidella that has an annulus is A. peckiana, and its annulus never persists much beyond the earliest stage of expansion of the cap.

Hence, I think this mushroom belongs in Amanita sect. Phalloideae. Cristina or I can take a look at the dried specimen if you’d like.

Very best,


under red oak
By: walt sturgeon (Mycowalt)
2011-10-12 19:51:00 CDT (-0400)

Created: 2011-10-12 13:05:01 CDT (-0400)
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