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At first I thought this was an example of brunnescens. Spores are broadly elliptic.


Proposed Names

68% (4)
Based on chemical features: sequences from two genes (nrITS and nrLSU).
84% (1)
Used references: A new name for “sp-amerirubescens07”:
Based on chemical features: nrDNA

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= Observer’s choice
= Current consensus


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Looking for similarities…
By: Dave W (Dave W)
2019-01-03 02:53:26 CET (+0100)

between this and Eric Smith’s 07 observation obs 147255. Eric’s mushrooms have quite a bit of UV material deposited on the caps. Mine (seen in this observation) shows virtually no deposits on the cap. Looks like a significant amount of UV material is deposited on the stipe base. Eric’s caps and this one of mine all seem to feature a lot of gray.

Rod, in response to a previous question of yours. On the location map, to the east of the location rectangle, one sees “Buck River Road”. This road goes through a small town/village called Thornhurst. When I google “Thornhurst”, I get Thornhurst Township which appears to entail at least part of the Lackawanna SF/Pinchot SF. There are at least several disjoint PA state forest tracts called “Pinchot State Forest”. This particular one is also called “Lackawanna State Forest Thornhurst Tract”, even though part of it appears to lie outside of Lackawanna County. The “system” on naming state forests in PA is confusing.

DNA sequences derived for nrITS and nrLSU have been posted to GenBank.
By: R. E. Tulloss (ret)
2019-01-02 22:41:28 CET (+0100)

Thanks, once again, David.

Happy New Year.


Rod, sorry for the very tardy reply…
By: Dave W (Dave W)
2016-01-18 02:39:35 CET (+0100)

but I just now saw your questions.

I believe the spores seen in the photo were the result of taking a print. It’s generally not difficult to get an Amanita to give up some spores, so I rarely need to mount Amanita gill material in order to see spores.

Thornhurst is a township in PA. The MO location map is accurate as to the general area where this mushroom was found.!1s0x89c4e463dd55be5d:0xd19e1c2cd800dfe8

Some questions.
By: R. E. Tulloss (ret)
2014-07-18 19:02:43 CEST (+0200)

Did you see a spore print?

I can’t find Thornhurst on the map. Is that a designation for the particular segment of the St. For.?

Very best,


Thank you, David.
By: R. E. Tulloss (ret)
2014-07-18 15:06:06 CEST (+0200)


I don’t recall the exact spot…
By: Dave W (Dave W)
2014-07-18 06:30:09 CEST (+0200)

where this was collected. But I can offer some generalities.

This is a typical acidic Pocono plateau environment. 30-50 year old maple, beech, birch growth interspersed with coniferous plots. The coniferous areas feature native hemlock, pine, and planted Norway Spruce. These areas also have some birch mixed in with the conifers.

I think this probably came from a coniferous area. I spend most of my time at this location hunting Boletus edulis.

No oak.

David, can you tell me anything about the ecology of the collecting site?
By: R. E. Tulloss (ret)
2014-07-18 04:40:04 CEST (+0200)

Very best,


For the second collection of “Amanita sp-amerirubescens07_”….
By: R. E. Tulloss (ret)
2014-07-18 04:16:52 CEST (+0200)

see observation #147255 from Eric Smith.


The cap color will be helpful here I think.
By: R. E. Tulloss (ret)
2014-07-18 04:12:08 CEST (+0200)

We got DNA sequences back for this collection recently. The sequences were new to us. I’m not sure that I can tell you how many rubescent taxa there are hiding under my presumptuous name “amerirubescens”. At the moment this will get the temporary code name Amanita sp-amerirubescens07."

We will certainly want to use your photos to illustrate the new page when we get it in order.

We have at least one other collection of this species—-from Oneida Co., New York.

Thanks again.

Very best,


Thanks Dave,
By: groundhog
2013-07-25 18:24:44 CEST (+0200)

This material has been received, accessioned into Rod’s herbarium, and scheduled for sampling.