Observation 23370: Amanita whetstoneae Tulloss nom. prov.
When: 2009-07-20
Herbarium specimen reported

Notes: Took a 4 day excursion into the woods around Plum Orchard lake. and once again the place is a mycological wonder land not to mention the 40 Lb of Chantreslls I scored. Found this Amanita near a creek where several birch where growing. Now apparently Amanita Vaginata Var. alba is only found in Europe. But this specimen is very white. and I thought it somewhat fit the description of R T Tulloss. At any rate its lacking a annul ring and has a sac like volva that falls apart easily.

Proposed Names

-7% (3)
Recognized by sight: found growing under mixed woods with primarily birch
Used references: R. E. Tullose Study of Amanita. Mushroomexpert.com
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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great to have those lab chemicals at your fingertips, eh?
By: Debbie Viess (amanitarita)
2009-07-21 10:08:57 PDT (-0700)

BTW, when i first collected this in Boone, NC last year, i thought that it was a big fat white grisette, too! Here’s the link to my obsie:

spores are Amyloid
By: Eddee (eddeeee)
2009-07-21 09:33:06 PDT (-0700)

Just took a look under the scope. Used iodine solution. The spores are amyloid way cool. So that makes it a possible A. whetstoneae.

Considering the flocculence…
By: R. E. Tulloss (ret)
2009-07-21 08:15:06 PDT (-0700)

on the stipe and the rather robust nature of the cap (even though I can’t see the striae because of the lack of focus) and the robust tubular volval sac. I’ll go for an Amidella here. Amanita vaginata var. alba is more gracile and has a smaller, less robust sac (collected it in Norway some years back).

Very best,


a sharper photo would be useful.
By: Debbie Viess (amanitarita)
2009-07-21 06:46:34 PDT (-0700)

what microscopic features did you use to ID?

another possibility for this mushroom in this area and at this time of year could be Amanita whetstoneae, which is similar to a big grisette, has a whitish, cream colored cap, also with striations, and a long loose volval sac like that shown here.

check whether the spores turn blue in Meltzer’s…a vaginate amanita won’t; an amidellla (like whetstoneae) will.

white versions of colored amanitas are not unique species IMO, just color variants. no vaginata alba here in North America, nor vaginata, for that matter.

Created: 2009-07-20 19:17:31 PDT (-0700)
Last modified: 2009-07-20 19:17:31 PDT (-0700)
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