Growing with conifers @ 6700 ft.
Cap 8.6 cm across.
Spores not amyloid.
Spores ~ 9.5-11.8 X 7.0-8.2 microns, ellipsoid.
Q(range = 1.28-1.54
Q(avg) = 1.40 n=17


Spores in Congo red + KOH @ 1000X

Proposed Names

29% (1)
Recognized by sight
58% (2)
Recognized by sight: clearly a gemmatoid amanita.
DNA necessary to confirm a specific ID.
Based on chemical features: no DNA confirmation.

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
I would be wary
By: Debbie Viess (amanitarita)
2018-06-25 10:38:16 CDT (-0500)

of assuming that this is alpinicola without running the DNA.

I also had a macro identical example (at least according to Cripps!) from the Yuba Pass area that turned out not to be alpinicola once the DNA was run.

Jan had asked me to keep an eye out for this critter long before the species was published!

AS we know, we have many gemmatoid amanitas here in the west that lack formal names.

Thank you, Ron.
By: R. E. Tulloss (ret)
2017-10-29 23:18:11 CDT (-0500)

Congratulations on the spore measurements. :)

Very best,


Thanks Rod and Alan and
By: Ron Pastorino (Ronpast)
2017-10-22 12:46:08 CDT (-0500)

the article from Mycotaxon is now available..
Also pleased to see that my spore measurements of this fb agree quite closely with the measurements by the authors for the species .

Alan, thanks for the link to the Rocky Mtn. Field Guide.
By: R. E. Tulloss (ret)
2017-10-10 14:13:05 CDT (-0500)

Very helpful. It establishes the link to the unpublished name of Smith, which is a nice nod to the latter.

Very best,


I would not consider the ibotengutake genetic distance information…
By: R. E. Tulloss (ret)
2017-10-10 13:56:55 CDT (-0500)

…significant as a stand alone fact…other than it helps establish the distinctness of the new species. The species are morphologically quite distinct. Moreover, Amanita section Amanita is not very thoroughly studied. A great deal of effort is expended on muscarioid taxa, but that level of effort has not been expended (successfully) on the section as a whole.


Thank you, Alan. I see that a second nrITS sequence has been posted from a…
By: R. E. Tulloss (ret)
2017-10-10 13:51:20 CDT (-0500)

…paratype. The GenBank accession number is KR152656. The only difference between the two sequences is that a multi-G repeat is one character longer in the holotype sequence than it is in the paratype sequence. That difference can be ignored according to my mentors because that sort of “stuttering” in copying a multi-character repeat can happen both in nature and in the sequencing process.

I checked the aforementioned sequences against my internal databases (including things not posted to GenBank at this time). I have never run into the alpinicola sequence(s) before.

Very best,


DNA sequence & Species description
By: Alan Rockefeller (Alan Rockefeller)
2017-10-10 12:20:21 CDT (-0500)

ITS sequence of the holotype collection:

Species description:

Interestingly, the closest BLAST match is 97%, from the holotype of Amanita ibotengutake, a toxic species described from Japan.

Very nice contribution, Ron.
By: R. E. Tulloss (ret)
2017-10-10 09:51:45 CDT (-0500)

Very best,


Created: 2017-09-14 16:35:17 CDT (-0500)
Last modified: 2018-06-29 21:33:06 CDT (-0500)
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