Observation 23799: Amanita caesarea group

When: 2009-08-01

Collection location: Howell Co., Missouri, USA [Click for map]

Who: nobo hobo

No specimen available

Proposed Names

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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I don’t think this is jacksonii…
By: R. E. Tulloss (ret)
2009-08-31 22:33:54 CEST (+0200)

Amanita jacksonii has an orange annulus, orange felted shreds of the in volval inner limb on the stipe, a pronounced umbo, and doesn’t change from bright red to yellow so quickly in wither time or space. I have been sent material looking like these images from the south eastern states in the last few years. They were not A. jacksonii.

Very best,


he removed images
By: Dan Molter (shroomydan)
2009-08-29 02:50:22 CEST (+0200)

these remaining are what they are

Debbie said
By: Paul Derbyshire (Twizzler)
2009-08-29 02:46:02 CEST (+0200)

what I was thinking. At this point, given the apparent annulus and the colors and location I’d concur with A. jacksonii.

I’m confused.
By: Debbie Viess (amanitarita)
2009-08-28 19:35:38 CEST (+0200)

first off, gorgeous mushrooms.

but isn’t that a bit of annulus that I see peeking out from underneath the left cap in that last duo? and wouldn’t those caps open and fade to look a lot like the others in this grouping? Now if you actually observed the mostly unopened fruit bodies in hand and saw that there was no annulus, then I’m not sure what the heck I’m seeing hanging down there beneath the cap…its yellow, tho, and it’s not the stipe.

I think your right.
By: nobo hobo
2009-08-28 05:51:25 CEST (+0200)

The last two don’t really seem similar to the first couple at all. The originals were on average about 8 in. tall and I even saw a few that were easily a foot tall. The later find was a bit smaller and like you said had no annulus. Unfortunately I have no dried specimens of the originals. Maybe next time.

just out of hospital and…
By: R. E. Tulloss (ret)
2009-08-24 05:20:03 CEST (+0200)

I’ve been missing a bit of the interaction on MO in the last several days due to an unanticipated hospital visit. Please excuse a short answer.

The last two shots on the current version of this observation don’t have an annulus on the stipe. I wonder if they might not be Amanita parcivolvata?

I would indeed like to see the exsiccatum. My mailing address is listed under the editors’ names and addresses section at the top of the Amanita Studies main page. When sending dried material to anyone it is a good idea to mark the package: “Dried and disinfected botanical material. For scientific study only. No commercial value.” This covers concerns of the US Postal Service and most international postal services. My local post office is quite used to receiving material that is so marked.

Thanks for keeping me informed.


sorry for procrastinating
By: nobo hobo
2009-08-21 05:35:37 CEST (+0200)

Rod you said that you would be interested in some dried material and photos. I just posted some new photos and have had a dried specimen for a while. If your still interested let me know where to send it. Sorry I neglected to take measurements. Whenever they decide to pop back up I’ll run outside and do that. Thanks.

Thanks to nobo hobo…
By: R. E. Tulloss (ret)
2009-08-03 00:19:53 CEST (+0200)

Dear nobo hobo,

Thanks to you I have found an important error and several omissions from the world Caesareae key on the Amanita Studies site. I will report when I have repaired the problems…which will take more than a few hours…possibly a couple of days or a week.


By: AmatoxinApocalypse (AmatoxinApocalypse)
2009-08-02 02:42:00 CEST (+0200)

Amanita jacksonii is one of my favorite edibles, I do not recommend others eating it though unless they are familiar with the other mushrooms in the genus.

herbarium specimen coming up
By: nobo hobo
2009-08-01 22:11:09 CEST (+0200)

If your interested in some dried material I can get you some. Those Amanitas have been poping up every where lately.

Well, it’s not A. caesarea, but what it is?
By: R. E. Tulloss (ret)
2009-08-01 19:06:55 CEST (+0200)

Amanita caesarea is a Mediterranean species with some close relatives living in Mexico.

I think that the species in these photographs is a “Slender Caesar” of the type found in eastern North America, central Africa, and eastern and southern Asia. The absence of an umbo on the cap, the yellow (as opposed to orange) annulus on the stem, and the absence of orange, felted fragments of the volva’s internal limb on the stem strongly suggest that this is not A. jacksonii. It is interesting that the cap seems to be entirely red at first, but quickly become strongly yellow at the margin.

The following provisional species “numbers” are applied to similarly colored taxa known (respectively) from Arkansas, Florida, and South Carolina: “sp. AR1,” “sp. F11,” and “sp. S10.” At present, they appear to be distinguished by spore size and spore shape, and (possibly) other characters. All three should be included in the key to known and “projected” species of Amanita [sect. Caesareae] stirps Hemibapha for the world (microscopy required for spore data):


[Give me a chance to update this document, I just {1:20 pm} found a set of relevant typographical errors. OOPS. No time leaving for my younget son’s wedding.]

I am not sure that I know enough to give a single name or number to nobo hobo’s very nice pictures. Dried material with some notes and good photos might help get a name on one of the unnamed taxa presented as “numbers” above.

Very best,


Created: 2009-08-01 18:02:36 CEST (+0200)
Last modified: 2009-08-01 18:02:36 CEST (+0200)
Viewed: 282 times, last viewed: 2017-08-29 01:05:14 CEST (+0200)
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