Observation 167973: Amanita “trygonion”
When: 2014-06-14

Notes: Growing in the Lance Rosier Unit of the Big Thicket National Preserve.
Caps up to 3.9 cm across with striations up to 5mm long.
Spore print white and not amyloid.
Spores ~ 10.9-14.9 X 10.9-13.0 microns, smooth and mostly globose to subglobose.
Q(range) = 1.00-1.20. Q(ave) = 1.08.

Proposed Names

81% (1)
Based on microscopic features: Different from everything in the Texas and Gulf Coast key’s tabular subkey for section Vaginatae
Based on chemical features: nrITS and nrLSU different from known taxa that have been successfully sequenced. Not a proof of novelty because the sample of sequences is still too limited.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
The page for this species on WAO is now located here:
By: R. E. Tulloss (ret)
2015-08-29 20:02:55 CEST (+0200)
When I finish the spore data, I’ll add this species to the Texas and Gulf Coast cheklist…
By: R. E. Tulloss (ret)
2015-02-19 23:35:40 CET (+0100)

that we’ve been working up on the Amanitaceae Studies website.

Very best,


The spores can be a bit less globose than shown in your image.
By: R. E. Tulloss (ret)
2015-02-19 23:32:59 CET (+0100)

from the first of the two specimens in the collection, I got the length-width ration (Q, for readers not yet familiar with it) with 90% of the values in the range 1.13 – 1.33. Hence, the spores are subglobose to broadly ellipsoid and (occasionally) ellipsoid. The average value of Q is 1.20.

The spore data is posted on the techtab of this page:


I will add more data as I have time to work it up.

Very best,


You’re welcome, Ron.
By: R. E. Tulloss (ret)
2015-01-31 03:47:06 CET (+0100)

I hope that it won’t take too long before we can say something more interesting. Very best,


Thanks for the update Rod.
By: Ron Pastorino (Ronpast)
2015-01-31 03:39:17 CET (+0100)
It is not too much of a surprise that the DNA sequences we have derived for this…
By: R. E. Tulloss (ret)
2015-01-31 03:29:19 CET (+0100)

material does not yet connect it to other material for which we have sequences. We obtained both the “proposed barcode” (nrITS) sequence and the nrLSU sequence for the voucher material you sent us from this observation.

I hope that we’ll have something more to say as time passes.

Thanks again for sending us this challenging material.

Very best,


Thanks Ron,
By: groundhog
2014-07-07 19:06:16 CEST (+0200)

This material has been received and accessioned into Rod’s herbarium. We have also scheduled it for DNA sequencing.

Please spread the word.
By: R. E. Tulloss (ret)
2014-06-21 13:20:03 CEST (+0200)

The Texas checklist was moved several years ago.

It is almost up-to-date (sp-MO01 is not in it yet) and now here:


with a semi-key for the Vaginatae built-in…so that I have a prayer of coping.

And you have been a co-author for a couple of years.

I’ve got to get rid of the old site. I didn’t realize that people were still using it.

Very best,


Hello, Ron.
By: R. E. Tulloss (ret)
2014-06-21 02:10:57 CEST (+0200)

I’m pretty sure that I haven’t seen this one. The spore dimensions are very large compared to what I’ve seen in sect. Vaginatae in Texas. If you’d be willing to share a part of this collection, I’d like to work it up for the Texas and Gulf Coast checklist on WAO.

Very best,


Created: 2014-06-21 01:41:38 CEST (+0200)
Last modified: 2015-02-02 17:43:35 CET (+0100)
Viewed: 111 times, last viewed: 2016-10-20 22:28:02 CEST (+0200)
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