Proposed Names

58% (1)
Recognized by sight: Old species #17.
94% (3)
Recognized by sight: David and RET can both recognize this species by sight in our own collecting areas.
Based on chemical features: The material from Roosevelt mentioned below is typical of the provisional species. The DNA provides good evidence that the PA and NJ collections belong to a single taxon.

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= Observer’s choice
= Current consensus


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While the apparent symbiont at my house is Quercus palustris (Pin Oak),…
By: R. E. Tulloss (ret)
2017-05-25 06:21:08 CEST (+0200)

there is at least one lawn in town with rooseveltensis under a Pecan tree (Carya illinoiensis). Carya is the genus of the hickories. additional sites in Roosevelt and Princeton have no Carya, but plentiful Quercus. Some of the sites have no conifers at all. Some have Pinus (but at a distance from the cluster of __rooseveltensis_ fruiting bodies. I think we will find that rooseveltensis is fairly common in the eastern U.S. Northern and southern limits of the range are not clear. Again, there is a lot of work to be done.

Very best,


My first summer here in Hunlock Creek…
By: Dave W (Dave W)
2017-05-25 03:12:44 CEST (+0200)

was 2001. I was hoping to be lucky enough to see Boletus edulis, or maybe at least a few scaber stalks under the giant white pines that lined the border of our property. Instead, right around the beginning of summer a multitude of gray Amanitas appeared on the lawn. The only thing I knew about them was they weren’t going into a risotto. But they were kinda cool, shiny-silvery when catching sunlight. It took awhile for me to realize… well, I think I realize… this species occurrence on my lawn is probably in association with a large shagbark hickory tree. A few small oaks and large white pine are also in the area, but at times the mushrooms were found over 60 feet away from any of the 20 foot tall oaks. Eventually, I found a few in another part of my property… no oak or pine at all, mature shagbark hickory present.

The first collections I ever made were in a park along the Delaware River on the
By: R. E. Tulloss (ret)
2017-05-25 02:04:20 CEST (+0200)

5th of July.

Very best,


Hello, Mary.
By: R. E. Tulloss (ret)
2017-05-25 02:03:13 CEST (+0200)

If there were oaks present, then you had a reasonable chance of finding rooseveltensis from the first of July onward.

Very best,


I wonder
By: Mary Smiley (ladyflyfsh)
2017-05-23 23:44:12 CEST (+0200)

If this is what I was finding prolifically last summer in Kennett Square on our property. They are small in stature. I was only visiting and didn’t do any chemical tests.

You’ve helped me a lot, David.
By: R. E. Tulloss (ret)
2017-05-23 03:15:09 CEST (+0200)

I think that new locations are best for additional material. We have a lot of your “old 17” material in the queue. These three came through on Friday, and I couldn’t get to them until today. To repeat, I’m very thrilled to have gotten data from the three collections cited below. We’ve been struggling with DNA from this species.

Very best,


Rod, that’s really gracious of you…
By: Dave W (Dave W)
2017-05-23 01:17:56 CEST (+0200)

to list my name as a co-author. Thank you.

We’re a couple weeks away from these starting up again in my yard. I can likely get more material for you, if this helps.

No web page yet. We just got the undertanding that we were looking at a…
By: R. E. Tulloss (ret)
2017-05-22 21:27:44 CEST (+0200)

new taxon. A page will be coming when time permit.

Very best,


On Friday, we received multiple sequences for the same species; and the sequence…
By: R. E. Tulloss (ret)
2017-05-22 20:41:48 CEST (+0200)

from this observation’s voucher was one of the three. We got the 3’ (right hand) end of the “proposed fungal barcode” gene (nrITS) and a large piece of adjacent nrLSU. A total of 1501 characters. We have never been able to get the nrITS in its entirety because of a problem such as has been reported with Amanita lavendula. The many copies of the gene are not identical in the present species. We now have three collections of Amanita rooseveltensis with very good matches to each other and to nothing else in our local database and GenBank. We still have unsequenced material of the “old sp-17 group.” Hence we don’t know whether they will all share the same nrLSU sequence. Today I have reviewed and edited one sequence from a sample from the Public School lawn in Roosevelt and one from a sample collected under a pin oak by the NE corner of my house, and Hunlock Creek collection reported in this observation.

We’ve waited quite some time to get any DNA at all from the “old sp-17 group.” I’m glad we’re getting the same species in both our collecting areas.

Thanks for your persistence, as always.

Very best,


Thanks Dave,
By: groundhog
2014-10-28 22:15:08 CET (+0100)

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

Yup. Could be. Could be.
By: R. E. Tulloss (ret)
2014-07-31 06:15:44 CEST (+0200)