Observation 148538: Amanita silvicola Kauffman



Proposed Names

82% (1)
Based on chemical features: nrITS and nrLSU sequences were obtained. The latter conforms well to sequences previously obtained from A. silvicola.

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Eye3 = Observer’s choice
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Thank you so much for the update!
By: Danny Miller (alpental)
2015-05-19 03:03:00 CDT (-0400)

Very interesting. I will continue to keep my eye out for unusual specimens.

We ended up with a very good sequence from the nrLSU gene…
By: R. E. Tulloss (ret)
2015-05-18 14:37:14 CDT (-0400)

a little jigsaw puzzle work, and we got a beaut. Your material extended what we know of two commonly sequenced genes in silvicola.

Thanks again.

Very best,


We obtained two good DNA sequences from this material.
By: R. E. Tulloss (ret)
2015-05-18 14:00:24 CDT (-0400)

Thank you, Danny.

We have our first “proposed fungal barcode” sequence and a good, although a little short, nrLSU sequence as well. The latter conforms extremely well to sequence derived from a different collection by Ben Wolfe in his thesis.

We very much appreciate your sharing this material with us.

Very best,

Rod Tulloss

Thanks Danny,
By: groundhog
2014-04-18 13:20:29 CDT (-0400)

This material has been recieved and accessioned to Rods herbarium. We are scheduling it for DNA sampling.
-Naomi (working with RET)

Sure, Danny.
By: R. E. Tulloss (ret)
2013-12-05 20:07:12 CST (-0500)

I’ll look at it.

Very best,


Immature spores are undersized. Also, spores on an old specimen can be undersized.
By: R. E. Tulloss (ret)
2013-10-29 23:25:23 CDT (-0400)

As a mushroom ages, the spores become smaller. The greatest changes are observed in the spore length. The width doesn’t drop at the same rate. As a consequence the length/width ratio also often drops with the aging of the basidiome.

To oversimplify just a little bit, Bas’ classification of the species of section Lepidella relied on spore size and shape, but more importantly on the detailed structure of the universal veil and the presence or absence of clamp connections at the bases of basidia.

If you are unsatisfied with the separation of species using spore size and shape, the other two characters are something to which you could turn for more information. I’d be glad to discuss this further.

Very best,


Amanita silvicola?
By: Danny Miller (alpental)
2013-10-29 18:42:29 CDT (-0400)

I scoped one of the many Amanita silvicolas that were found at a foray this weekend, to compare to this mystery Amanita, and it was very similar! It had the same size spores, smaller than they should have been for A. silvicola, so I’m wondering if you think this could be a worn out A. silvicola? And our local material either has small spores, or I am just finding immature spores.

Thank you, Danny.
By: R. E. Tulloss (ret)
2013-10-24 17:04:14 CDT (-0400)

It would be interesting to see if a more mature specimen could be found.

Very best,


Collection information
By: Danny Miller (alpental)
2013-10-24 16:51:50 CDT (-0400)

I’m sorry to hear that, and I wish you and your family the best.

I was able to track down the person who collected it. It was in North Bend, WA. 47.488 -121.705, elevation ~1020’, maple and conifer, a site I can easily visit to get more information

Hello, Danny.
By: R. E. Tulloss (ret)
2013-10-15 18:02:57 CDT (-0400)

You’ve caught we at a bad time…illness in the family. I’d be glad to take a look at the dried material. I agree the spores are rather small. Maybe the material was very young when it was dried, and you are not seeing fully matured spores.

I agree that you’ve got something from section Lepidella. The stipe base would argue against smithiana.


Could be…
By: Danny Miller (alpental)
2013-10-15 16:11:02 CDT (-0400)

spores are at the way low end of the range, but that’s the best theory so far!

Cap seems a bit smooth
By: Christian (Christian Schwarz)
2013-10-15 16:00:58 CDT (-0400)

but there are floccose-felted patches, and with a swollen/tapered/triangular stipe base, why not A. smithiana?

What the heck is this?
By: Danny Miller (alpental)
2013-10-15 15:35:29 CDT (-0400)

Partial veil was present.
One came into the PSMS annual show and another came into a PSMS ID Clinic, don’t know where they got it. :-(

Created: 2013-10-15 15:29:12 CDT (-0400)
Last modified: 2017-12-29 09:48:01 CST (-0500)
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