Observation 181987: Leucoagaricus Locq. ex Singer

When: 2014-10-08

Collection location: Delta, Delta Co, Colorado, USA [Click for map]

Who: Sandi (sandmason)

No specimen available

Proposed Names

44% (2)
Recognized by sight: That can’t be a volva… o_O

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


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I asked Dr. Vellinga’s opinion on your photos and my microscopy
By: R. E. Tulloss (ret)
2014-11-11 16:57:03 CST (-0600)

She said “I guess this is either Leucoagaricus barssii, or in the Leucoagaricus leucothites group (less likely).”

Very best,


Hello, Sandi. Here’s an excerpt from the email I just sent to you.
By: R. E. Tulloss (ret)
2014-10-23 10:08:28 CDT (-0500)

Your material does not fall into the Amanitaceae. The gill trama is “regular.” That is, all the elements of the tissue of the gill (between the bases of basidia on the opposite faces of the gill) are arranged in parallel rows running from the cap flesh to the bottom edge of the gill.

In all species of the Amanitaceae, the tissue of the gill is organized into two mirror-image halves (is “bilateral”) and these elements of these two half curve downward and outward from a central layer (in which the elements are roughly parallel to each other) to specialized tissue that underlies the bottoms of the basidia (is “divergent”).

This microscopic character is one of the defining characters of the Amanitaceae.

Hence, your critter doesn’t belong in the Amanitaceae.

If you would like me to forward the material to someone with different expertise, I’ll be glad to do so.

Thank you for sending the specimen.

Very best,


That’s OK, Sandi.
By: R. E. Tulloss (ret)
2014-10-09 14:20:38 CDT (-0500)

My postal mailing address is here:

http://www.amanitaceae.org?About our editors

Very best,


By: Sandi (sandmason)
2014-10-09 12:53:08 CDT (-0500)

I don’t have Melzer’s, I’ll just send it and you can see if it will reinflate. Raining now, perhaps another will emerge.
I’ll see if there are more photos that show the cap better and email to you.

Thank you.
By: R. E. Tulloss (ret)
2014-10-08 20:31:22 CDT (-0500)

Thorough drying is important. If we are to get a chance at reinflating the cells of the gills and extracting DNA.

As to a suggestion of an ID…

I don’t think I’ve ever seen an Amanita like this one before. It seems to have a membranous volval limb if not a true sac. I don’t think there are striations on the edge of the cap. (Am I right about that?)

There looks like there is something on the cap surface that is pale reddish.
Do you see what I mean or are my eyes making this up?

Do you have Melzer’s Reagent?

Very best,


Will Send
By: Sandi (sandmason)
2014-10-08 11:10:31 CDT (-0500)

I need to let it dry and will send it. It’s 33mmX37tall.
Propose another name?

I actually collected prairiicola in Denver (from a person who came to a lecture…
By: R. E. Tulloss (ret)
2014-10-08 11:01:47 CDT (-0500)

I gave at the Botanical Garden). The real collector had found prairiicola at a bus stop if I remember correctly.

If you’d like to send me the material (or half of it split longitudinally), I’ll take a look at it and let you know what I find.

Very best,


Not prairiicola
By: Sandi (sandmason)
2014-10-08 10:49:39 CDT (-0500)

I do have the specimen. First ever and probably last.
I’d like to know what it could be.

If that is a membranous volva at the base of the stem,…
By: R. E. Tulloss (ret)
2014-10-08 10:28:26 CDT (-0500)

then this can’t be prairiicola, which has a very friable volva composed of chains of elongate inflated cells. It should have fluffy stuff on the stem below the ring.

There is some information about prairiicola here:


The MO data says you didn’t keep the specimen. Is that correct?

Very best,

Rod Tulloss

Created: 2014-10-08 09:21:42 CDT (-0500)
Last modified: 2014-11-11 17:23:05 CST (-0600)
Viewed: 134 times, last viewed: 2017-09-11 09:42:15 CDT (-0500)
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