Observation 9075: Amanita sect. Caesareae Singer

I thought these were Amanita banningiana, and they might be, but the annulus was white instead of yellow.

They opened up a little bit over night, and this morning the annulus on one was starting to turn yellow (last photo).

Spore print and tissue samples available.



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I would now suggest sp-W15 or sp-S10….
By: R. E. Tulloss (ret)
2017-12-31 16:53:20 CST (-0500)


8829 and 8501
By: R. E. Tulloss (ret)
2008-08-16 15:08:40 CDT (-0400)

Yes, Dan, I agree with you that 8829 and 8501 should be considered as the same taxon you present in this observation. It’s just too red for Amanita banningiana and lacks the red-orange or orange stipe decoration and ring of A. jacksonii.

Note: Dan is going to send me some of this material, and we’ll see what comes of that.


large unedited images added.
By: Dan Molter (shroomydan)
2008-08-16 13:29:20 CDT (-0400)

Images 17060, 17061, and 17417 are of a single specimen that was not collected.

All other images are of the same two specimens .

Same as 8829
By: Dan Molter (shroomydan)
2008-08-15 15:55:07 CDT (-0400)

I would call the mushrooms in these photos the same as those in 8829.

Both mushrooms were growing in the same general location, but the ones in 8829 had been rained on. I suspect the rain and possibly age are responsible for the lighter color. The red-orange coloration fades into yellow as the mushrooms mature.

For what its worth, I think the mushrooms in 8501 are also the same specific kind, but I tend to be a lumper.


What’s the taxonomic placement of this bright-faced young critter?
By: R. E. Tulloss (ret)
2008-08-15 14:09:53 CDT (-0400)

Dan emailed me about this collection; so I have come back to stare at it some more.

I don’t know of any material of A. jacksonii in which the stipe decoration was neither orange nor red-orange. It could be that there are color variants. On the other hand, I’ve never seen or heard a report of such. On my third hand (what? oh, well — I wish), I think I may have seen one or more bright colored (red and yellow) capped species of the Hemibapha stirps (informal grouping) that looked like this. Maybe one from Florida or Georgia. Maybe another from David Lewis in east Texas. Dan has offered some of his dried material associated with this observation, and I have said I’d like to see it.

With a world key to known (even if not yet named) taxa of Amanita sect. Caesareae now on-line here (772 KB download), I can test that key with Dan’s material. Among the possibilities are the following: (1) I have already given this material a number and can recognize it when I see it again, (2) it cannot be distinguished morphologically from A. jacksonii except for the differences in pigment distribution, (3) my key is unworkable (gee, I hope not), (4) add your favorite type(s) of taxonomic screw-ups.

Dan and/or I will report back in future.


P.S. Dan, how do you see observation 8829 in relation to 9075? -R

P.P.S. At the just-past MSA meeting at Penn State, Dr. J.-M. Moncalvo told several of us that he has completed a phylogenetic tree for Amanita sect. Caesareae. This may include all the material that I sent him (at least the material from which DNA could be extracted), which could impact our understanding of taxa in sect. Caesareae a little or a lot. Nathan Wilson was laying a heavy trip on the aforementioned gentleman with regard to A. calyptroderma and its friends and relations. We’ll have to watch for a Moncalvo paper on this group of taxonomically interesting (=sometimes rather difficult) amanitas…of course, some are famous edibles in addition to being beautiful and interesting to taxonomists. -R

Created: 2008-08-13 13:45:20 CDT (-0400)
Last modified: 2017-12-31 16:53:21 CST (-0500)
Viewed: 115 times, last viewed: 2018-01-16 16:51:30 CST (-0500)
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