Observation 147255: Amanita “sp-amerirubescens07”
When: 2013-10-03

Proposed Names

45% (2)
Recognized by sight: Good sized Amanita. Gray universal veil covering a blushing cap. Gills with flocculent edges. Partial veil breaks from the cap cleanly creating a large annulus that is white and striate on the upper surface and stains pinkish, becoming brownish on the underside. Stem covered with pinkish brown fibrils. Bulb grayish with small clefts with shape and staining very much like A. amerirubescens. Scent is apple-ish. In sandy soil from mixed woods with maple, beech, oak, pine and hemlock. Amanitas muscaria, crenulata, and “citrina” found close by.
94% (3)
Eye3 Eyes3
Based on chemical features: Sequences from two genes (nrITS and nrLSU).

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Eric Smith (esmith)
2014-07-20 16:20:17 CEST (+0200)

How cool is that!?! A new blusher on the block! The universal veil material on the cap is so different than anything I’ve seen on a blusher before that I wouldn’t be surprised if another organism was affecting the appearance. More discoveries make more mysteries…

This note also addresses Erlon’s question re “natural gray” on the volva of eastern N. Am….
By: R. E. Tulloss (ret)
2014-07-19 07:08:32 CEST (+0200)

rubescent taxa.

It’s late. I hope this is coherent.

I looked at the present material in comparison with David Wasilewski’s collection of this species that lacks the gray volval warts on the cap and elsewhere. Material of the present collection has much of the thickness of the volval warts eroded by decay. The necropigment is in two layers. The surface of the warts (probably not the original surface) comprises broken and gelatinized hyphae and inflated cells that sometimes have a saturated brown-orange content at 1250X. Below the surface, the inflated cells are a very pale brown or colorless (in both cases transparent) and are often collapsed, but not showing the same signs of decay as in the surface layer. There is no sign of soil particles or other detritus on the upper surface of the warts. The color appears to be attributable to decay.

It will be necessary to look for pale pigment in the inflated cells of Dave’s material to understand the state of the tissues in uneroded warts.

The spore shapes of the two collections are not quite the same on average, which might suggest that one or more environmental conditions (including attack by another organism) is contributing to modifications to the fruiting bodies in Eric’s collection.

I did make an effort to look for foreign hyphae that might be impacting the color of the warts when viewed with the naked eye. I did find a dark hyphomycete with thickened side walls and even thicker septa which all were perforated. Such hyphae do not occur in Amanita tissue. However, such hyphae were not very common; and they could be from an organism capitalizing on the food made available by decay of the volval elements or could be a causative agent with regard to that decay. At any rate, I don’t think the apparent graying of the volva was due to foreign pigmented hyphae in the section I examined.

At present, I think David’s specimen might represent a very young specimen with a cap surface that has dried in situ; and Eric’s collection may represent young material that is modified by unknown causes impacting the decay of the volva and subsequent change in pigmentation and impacting the size and shape of the spores.

The genetics are the same in the two genes sequenced from both of the collections of concern, but the life history of the organisms in the two collections seems likely to have differed.

We have a newly recognized organism that comes with one or more attached biological mysteries.

Very best,


nice when the DNA
By: Debbie Viess (amanitarita)
2014-07-18 18:02:23 CEST (+0200)

confirms what our eyes can clearly see.

We have just been able to confirm that this material has genetic sequences….
By: R. E. Tulloss (ret)
2014-07-18 04:26:50 CEST (+0200)

different from all the sequences we’ve previously seen from rubescent taxa in eastern North America. I just made this same report on an observation of Dave W’s (MO #138823). We have given the temporary code “sp-amerirubescens07” to this taxon represented your collection and his.

David reported that the caps in his collection at first suggested A. brunnescens to him. In that case the caps largely lacked volval material…the opposite of the situation in your images.

It will be interesting to see where further study will take us from here. A very interesting collection.

Thank you again for your continuing support of research on Amanita.

Very best,


Thanks Eric,
By: groundhog
2014-04-18 20:30:17 CEST (+0200)

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

I just go two emails
By: R. E. Tulloss (ret)
2013-10-11 03:58:32 CEST (+0200)

from Dr. Hughes indicating that two of the rubescent taxa we have been tracking have been found recently and produced good quality sequences. I’ll be very interested to see all your rubescent material.

Very best,


By: Eric Smith (esmith)
2013-10-11 01:11:23 CEST (+0200)

for the interest and comments Rod and Debbie!

I have plenty of this material dried and will be sending it out in the next few weeks along with the many other samples I have for you. I didn’t get all the rubescent taxa I was hoping to send you but I did alright…

and yet another…
By: Debbie Viess (amanitarita)
2013-10-10 01:28:12 CEST (+0200)

way cool, dark volva blusher!

nice find.

what a year for amanitas!

This material is so distinctive.
By: R. E. Tulloss (ret)
2013-10-10 00:23:34 CEST (+0200)

It might help clarify the differences between our rubescent taxa (in eastern North America) that can be seen by the naked eye.

I’d like to try to get DNA from this material.

Very best,


Created: 2013-10-04 01:47:27 CEST (+0200)
Last modified: 2014-07-18 22:33:43 CEST (+0200)
Viewed: 205 times, last viewed: 2016-10-21 21:34:36 CEST (+0200)
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