Observation 100561: Amanita amerirubescens Tulloss nom. prov.

When: 2012-07-15

Collection location: Meramec State Park, Missouri, USA [Click for map]

Who: Patrick Harvey (pg_harvey)

No specimen available

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Proposed Names

28% (3)
Recognized by sight
57% (4)
Eye3 Eyes3
Recognized by sight: A fairly variable species

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Thanks for the note, Patrick.
By: R. E. Tulloss (ret)
2012-07-16 15:23:00 CDT (-0500)

The photograph of the cap from above shows patches of pulverulent gray, volval material; so I think this is a species of Amanita. The staining reactions suggest one of the rubecent taxa. The cap looks very pale, maybe too pale for “amerirubescens.” I can’t eliminate “amerirubescens”, but there are other possibilities such as Amanita rubescens var. alba Coker and the pallid, rubescent, possible species I have seen in Arizona (U.S.) and central Mexico (A. sp-AZ10).

The latter has some data posted on the web at



Dave, I think I agree with you
By: Patrick Harvey (pg_harvey)
2012-07-16 11:59:08 CDT (-0500)

It has been hot & dry here (and at Meramec). They had rain that just missed them the night before. It was on the table all day, in the sun. Picture on Dr. Tulloss’ site looks an AWFUL lot like it, even the almost total lack of warts:


This fits too, from his description: “The volva on the stem is the same color as that on pileus; this material is easily lost during collection.”

Patrick, I did look at the cross section.
By: Dave W (Dave W)
2012-07-16 11:44:47 CDT (-0500)

There’s a bit of staining in the context of the cap, just under the center of the cuticle. Accounts of rubescens types mention that the context stains reddish/brownish slowly. So I’m wondering how much time passed between the slicing of the fruit body and the photo. Also, I’m wondering if the quickness of the reaction may be affected by atmospheric conditions. I’m guessing it’s been pretty hot there in your neck of the woods.

Note the cross section
By: Patrick Harvey (pg_harvey)
2012-07-16 08:13:41 CDT (-0500)

There is ABSOLUTELY no red staining.

Created: 2012-07-15 15:39:06 CDT (-0500)
Last modified: 2012-08-21 09:43:39 CDT (-0500)
Viewed: 105 times, last viewed: 2017-06-13 06:40:11 CDT (-0500)
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