Observation 23123: Amanita rooseveltensis Tulloss, Kudzma, & Wasilewski nom. prov.

When: 2009-07-12

Collection location: Luzerne Co., Pennsylvania, USA [Click for map]

Who: Dave in NE PA

Specimen available

This small shiny grayish Amanita appears on our lawn every summer. Usually it is a very early arrival. This is the first one for this summer. I think it probably favors warm sunny weather. I managed to dig this one up without destroying the friable volval sac. No spore print this time; I wanted to dry this nice specimen. There will be more of them. Note the sinuate gill attachment. These are always found on the open lawn, usually 10 or more feet from a wood border. Trees in the woods are oak, birch, and White Pine. Stipe buried over one inch deep in the soil.

Last year I sent some of these to Rod, and I believe that he had a few ideas about the ID. But if I remember correctly, no final determination was made. So I’ll continue to make collections this summer.


These spores come from a different specimen of this same type which was collected in the exact same location as 23123. Shape and size is somewhat variable, but they seem to fit in with species #17.
Found three more on my lawn today. I managed to dig one out of the ground with volva intact.
Found three more on my lawn today. I managed to dig one out of the ground with volva intact.
Found three more on my lawn today. I managed to dig one out of the ground with volva intact.

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Add Comment
This specimen…
By: Dave W (Dave W)
2018-01-04 15:21:46 CST (-0500)

was found on the same piece of sloped lawn where many (other) examples of A. rooseveltensis have been observed. There are look-alikes, some of which I have found in this same location. (Spore photo actually represents a different specimen.) So, although I believe this to be an example of rooseveltensis, the supporting information is not quite sufficient to make this proposal with ultimate confidence.

Thanks David,
By: groundhog
2014-04-25 17:27:23 CDT (-0400)

This material has been accessioned to Rod’s herbarium. Rod looked at spores briefly under the microscope and found it was close to “old sp-17”

Image 52227
By: Dave in NE PA
2009-08-01 20:17:38 CDT (-0400)

taken 08/01/09.

nut trees can be culprits…
By: R. E. Tulloss (ret)
2009-07-18 13:35:36 CDT (-0400)

The shagbark hickory and the walnut could be symbionts of the Amanita.


Hope to get a few more
By: Dave in NE PA
2009-07-18 10:23:53 CDT (-0400)

soon. BTW, I DO now recall finding a few of these (at least I think they were the same) growing in a spot on our property where there were absolutely no oak trees nearby… Shagbark Hickory, maple, Black Walnut, rhododendron.

on same track…
By: R. E. Tulloss (ret)
2009-07-16 17:35:48 CDT (-0400)

Dave, we’re on the same track. I was thinking of sp. 17 from the pine barrens list. Actually, there may be two taxa hidden under that one concept. At any rate, broadly ellipsoid to ellipsoid spores are an important part of my current understanding of sp. 17.

very best,


I have seen
By: Dave W (Dave W)
2009-07-15 07:56:04 CDT (-0400)

what appears to be the same type, mostly, if not always, nearby oak in open grassy areas. From the “Pine Barrens” list, species 17 = A. vansantiana and species N30 appear similar to mine. Hoping to collect another specimen soon in order to get a spore print.

I think…
By: R. E. Tulloss (ret)
2009-07-14 23:54:59 CDT (-0400)

I think that I have seen this on lawns in central New Jersey…always associated with oaks. Amanita virginiana is brown and has an annulus (although it disappears quickly). Its cap is quite small and becomes indented in the center. It’s small and sometimes seems to have been exploded like a kernel of popcorn during the expansion of the mushroom. Amanita virginiana should be in sect. Caesareae unless there is a mistake on the website. I think this species is a member of section Vaginatae. If it is the same species that we have on the public school lawn in Roosevelt, NJ, it will have spores that are broadly ellipsoid to ellipsoid. These will distinguish it from A. vaginata.

You might want to take a look at the Vaginatae on the checklist page for the New Jersey Pine Barrens and surrounding areas:


Very best,


Friable volva
By: Dave in NE PA
2009-07-12 19:55:52 CDT (-0400)

is always buried fairly deeply, and desintegrates as the mushroom matures. This is one of the very few times I have managed to dig one up without completely destroying it. Color is always a shiny metalic silver/gray… never any brown tones. Phillips lists gill attachment for A. vaginata as “free.” In older specimens, cap margin often splits apart radially. Occasionally, the marginal striations disappear. Duller gray volval patches on cap sometimes present.

There are a few other ringless volvate Amanitas (besides vaginata and fulva) that resmeble this one… cecilia, sinicoflava… But the metalic gray cap color of 23123 which is a constant for this type is not seen in any of these others. I have seen this type in other places besides my lawn; usually open grassy woods with oak nearby.

Actually it occurs to me now that Rod did mention a possible name… perhaps A. virginiana or something close to that?… Just checked. A. virginiana looks very close, except that one sometimes shows a ring on the stalk. See web address below.


If you look at the cap color
By: Gerhard Koller (Gerhard)
2009-07-12 18:46:31 CDT (-0400)

I would say this is the REAL grisette :)

I cannot recall
By: Dave in NE PA
2009-07-12 12:07:01 CDT (-0400)

ever seeing a ring on one of these. Color is a bit shiny for a Grisette. Also friable volval sac is always buried, and striations on cap margin often disappear.

No ring on stalk…………
By: Johannes Harnisch (Johann Harnisch)
2009-07-12 11:44:33 CDT (-0400)

like Amanita vaginata there is no ring on the stalk………..that is interesting

Created: 2009-07-12 11:35:07 CDT (-0400)
Last modified: 2018-01-04 15:21:47 CST (-0500)
Viewed: 180 times, last viewed: 2018-01-22 12:28:58 CST (-0500)
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