Observation 222570: Amanita jacksonii Pomerleau

When: 2015-11-11

Collection location: Pride, Louisiana, USA [Click for map]

Who: Logan Wiedenfeld (LoganW)

Specimen available

I think I finally located the real A. jacksonii instead of yet another impostor. Growing among young longleaf pine.



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I should have said that there is no reason to say Santiago’s taxa are …
By: R. E. Tulloss (ret)
2016-07-18 14:20:26 EDT (-0400)

cryptic with respect to jacksonii. The latter is very often distinguishable in the field by macrocharacteristics (especially in young material).


This material is in my herbarium (RET 724-6) as jacksonii.
By: R. E. Tulloss (ret)
2016-07-18 14:17:49 EDT (-0400)

After I received images of the material from Mexico that Santiago segregated as species by mathematical means, I discovered to my delight that none of them had red caps. Their caps are largely yellow. There general appearance in the field is more like that of Amanitasp-W15.”

Therefore, it is still true that a cap that is originally all red on a stem that has fragments of red-orange partial veil on a yellow background and is found in the eastern U.S. and eastern Canada and has spores as described on the techtab here

( http://www.amanitaceae.org?Amanita%20jacksonii )

can be called jacksonii with fairly high confidence. I don’t recall an exception.

Very best,


was this sequenced?
By: Debbie Viess (amanitarita)
2016-07-18 13:48:42 EDT (-0400)

and did it turn out to be jacksonii?

is there a fool-proof method for IDing this sp. macroscopically, or are we just dreaming? DNA is not very practical for most.

Thank you, Logan.
By: R. E. Tulloss (ret)
2015-11-12 23:11:05 EST (-0500)


You sound
By: Logan Wiedenfeld (LoganW)
2015-11-12 22:18:44 EST (-0500)

unconvinced, Rod, but after reviewing the pics and your description, I can’t figure out why. I was thinking that the bright red cap in the button phase, the yellowish gills, and the yellow fibrils adhering to the stipe would suggest A. jacksonii. Of course, I have been consistently wrong in the past when it comes to this species, so clearly my judgment is lacking.

Whatever the case, I’m sending you a sample along with the other material you requested. I’d love to hear about your findings for this and the other material I’ve sent in the past.

Thanks again for all your help.


If you would like to try it out, I would be glad to include it in the queue for…
By: R. E. Tulloss (ret)
2015-11-11 17:06:06 EST (-0500)

DNA sequencing.

Very best,


Created: 2015-11-11 11:35:04 EST (-0500)
Last modified: 2018-01-06 11:29:48 EST (-0500)
Viewed: 92 times, last viewed: 2018-01-06 13:08:20 EST (-0500)
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