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Based on chemical features: See ret’s comment regarding DNA.

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Hi, Rod.
By: Dave W (Dave W)
2020-01-12 22:32:48 CST (-0600)

Really pleased to see you got useful data from this mushroom.

As previously discussed, this one is quite pale. Amount of cap pigmentation seems to vary quite a bit, even for the rooseveltensis that I have collected from this one location. Since 2013 a decent chunk of this lawn has been sacrificed for an array of ground-mounted solar panels, and I now wonder if the maximally sunny patch had produced the palest ones.

I don’t recall hearing about your albino example of rooseveltensis, Rod. Was it completely lacking in cap pigmentation? The one seen here appears to be slightly darkened on the disc.

Happy New Year!

Hi, David.
By: R. E. Tulloss (ret)
2020-01-12 13:27:08 CST (-0600)

The voucher material that you sent to me was sequenced last fall. Since we base recognition of Amanita rooseveltensis on recognition of a large piece of he nrLSU sequence, I’d say this is rooseveltensis. On the other hand it is very, very rare for that species to yield an nrITS seqeuence complete. I am delighted to report that we got (barely) a complete nrITS. As usual, the forward and reverse reads were both incomplete; however this time the forward and reverse reads overlapped in one character. Well, that was nice of them. Anyway, we have an nrITS sequence that appears to be what we have not seen before…a barcode from rooseveltensis. Did I tell you that one of my specimens from Roosevelt, appears to be an albino rooseveltensis?

Happy New Year!

Very best,


Some of the spores…
By: Dave W (Dave W)
2017-05-23 13:44:11 CDT (-0500)

for this mushroom seem long for rooseveltensis. But most are broadly ellipsoid, which fits this species. Cap color paler, less gray than ones currently understood as rooseveltensis. Found in same location as obs 170995.

Hello David,
By: R. E. Tulloss (ret)
2013-05-02 12:21:12 CDT (-0500)

This material has been accessioned into our herbarium.


This one is in the attic drying.
By: Dave W (Dave W)
2012-07-13 10:20:46 CDT (-0500)

It should be ready today. Obs 100142 will also so available, along with other material that believe is the same type (from the same exact spot, previously posted). Everythig will get sent in one mailing this fall. But if there’s something that you’d like to see sooner, Rod, let me know and I’ll put it into the mail.

Very interesting and not familiar to me.
By: R. E. Tulloss (ret)
2012-07-12 22:55:14 CDT (-0500)

Nice shots. I agree about the spore shape.

Dave, I’d like to take a look at this one sometime.


Same exact collection site…
By: Dave W (Dave W)
2012-07-12 21:41:59 CDT (-0500)

as where I have found hundreds of “Vaginatae old species #17.” But the cap color is lighter on this one. And the stipe base was buried only up to the rim of the volval sac. Spores are fairly elongate for Vaginatae types. I believe I have found this type in the past, in the same location; but not commonly.