Observation 110108: Amanita “sp-MO01” Tulloss nom. prov.
When: 2012-09-17
No herbarium specimen

Notes: Chocolate Brown color, with Cup remnants on cap.
Very firm/hard cup was found about two inches deep in soil.

Proposed Names

-60% (2)
Recognized by sight: It shades different colors of brown and has a radially lined margin. Using my handy dandy articulating mirror I can tell you that it’s gills are narrow, crowded, and white as expected.
54% (1)
Recognized by sight
81% (1)
Recognized by sight: So far as is known at the moment, this is the first collection of this taxon I’ve seen.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I hope you are doing well
By: John McDonough
2014-03-18 14:39:19 PDT (-0700)

Thank you for the last update. I trust that you have made it through this crazy winter unscathed!
I look forward to more information and your final opinion when available.

Spring is close here and before long the Morels will be singing to me, but I will always keep my eyes searching for more Amanitas.
Have a great day!

We got a good set of spore measurements from this material today.
By: R. E. Tulloss (ret)
2013-11-17 11:28:12 PST (-0800)

The specimen has also been sampled for DNA sequencing. The spore are fairly wide. In several ways, the species seems close to A. spreta; however, the form of the volva is unusual for that species. Also, the spores are quite broad in comparison to the average spores of the material of spreta that I have measured. I’m going to keep an open mind on whether “sp-MO01” might be very close to, or the same as, spreta.

More when we know more.


I rewrote the instructions on how to get the pdf(s).
By: R. E. Tulloss (ret)
2012-09-25 14:18:36 PDT (-0700)

I tested the method, and it works for me when I am logging in as a user (as you would). Sorry for the delay.


2nd observation has been created
By: John McDonough
2012-09-25 12:16:21 PDT (-0700)

the link to your two sided field notes form gives me a syntax error. Can you take a look and send it to me again.
Yes I got your Workshop document in the first email you sent me, thanks.

I figured a new observation was in order:)


Please start a separate observation. [Edited to correct link to form three times :(]
By: R. E. Tulloss (ret)
2012-09-25 10:10:19 PDT (-0700)

This is good news.

Since I can differentiate your collections by the MO observation numbers (any other mycologist would be interested in having separate identifiers, too), it’s important to make separate observations representing separate collections…EVEN IF THEY ARE FROM THE EXACT SAME SPOT.

It would be very helpful if you would try to fill out a collection form for this species (since it may be a new one to me).

A two-sides-of-one-sheet version of my field note form can be found In the following way:

Go to the “how to” page on the WAO site:


Click to go to the “Brief ‘How To’ Articles.”

Click to read the article on “Morphological Study Methodology” (about mid-page).

Go to near the bottom of the page of the MSM article (or search for “Blank form” with the search function of your browser). There you will see the download for the blank note form pdf and for two pdfs providing sample forms that have been filled-in in my crumby handwriting. All three may prove useful to you. I have tested this method of getting you the forms and it seems to work. (Bah. Has to be improved.)

Use of it is discussed in the workshop pamphlet that is used by Cristina and me. I hope I already sent you a copy of it. If not, yell.


Do you want to see another one?
By: John McDonough
2012-09-25 09:06:07 PDT (-0700)

I returned to the area this morning, yep you guessed it! Another single specimen has appeared about 6 feet away from where I found the first one that you now have.
This one has already started to open up and has very friable gray volva, but not near as much as the smaple I sent you. It is the same exact color as the first, identicle stripe, and beautiful radial lines at the cap margin.
The remaining cup is very hard and fragile.
I can dry this little lady and send it if you like? I got several great photos of this new one. Should I post them here or start another observation?

For the moment, I’m going to assume that this is something I’ve never seen before.
By: R. E. Tulloss (ret)
2012-09-25 08:57:28 PDT (-0700)

So I gave it a code number.

Now we’ll see how the story goes from here.


Having the dried specimen in hand,…
By: R. E. Tulloss (ret)
2012-09-24 20:20:53 PDT (-0700)

made me go back to the pictures; and I noticed in the pictures and on the dried specimen that there is a distinct, membranous, persitent partial veil on the stem. So section Vaginatae is not a possibility.

More later.


Your welcome!
By: John McDonough
2012-09-24 16:12:39 PDT (-0700)

I enjoy finding interesting things, particularly mushrooms; and here lately Amanita’s it would appear.
I find time to look almost everyday, and now that I have Mushroom Observer you get to look with me.
The multiple annuli specimen’s (I dried two for you) were shipped today.
I hope you enjoy those as well. That first ones stalk caught my eye from a long way off!

The material arrived today in good order, John. [edit]
By: R. E. Tulloss (ret)
2012-09-24 15:23:52 PDT (-0700)

Thank you very much for sending it.

It is a very curious combination to have an upper part of the volva so friable and the very bottom of the volva like a hard inverted cone. I’m very curious to know whether this is something that is really close to species like A. borealisorora or not.

Very best,


Thank you very much, John.
By: R. E. Tulloss (ret)
2012-09-18 13:51:15 PDT (-0700)


By: John McDonough
2012-09-18 12:44:26 PDT (-0700)


The specimen is dry and will be headed your way via UPS today.
Please keep me informed of any further details you find interesting.
Happy hunting!


That’s a good story.
By: R. E. Tulloss (ret)
2012-09-18 12:28:55 PDT (-0700)


That’s a nice job of tracking the changes. Indeed many people miss the graying of the gills that happens in the species of sect. Vaginatae that have a volva that becomes gray and friable. So… Good job.

I agree that we can eliminate sp-T44, as you suggested.

The species seems to fall into the group including A. sororcula and A. borealisorora. There is also a code number based on Texas material (“sp-T01”) that may be the same as the latter taxon…or not.

I’ll take this opportunity to say that the name borealisorora (which is a provisional name) will be abandoned by me in favor of A. rhscopus (a prov. name of Yves Lamoureux) if the two names turn out to refer to the same organism. This possibility is currently under review in cooperation with Yves Lamoureux and our mutual friends in the Cercle des Mycologues de Montreal.

I think that it is important to honor Yves’ contribution to mycology by joining in validation of his name.

I hope to have the needed data in hand before the end of the year.

Some links:




I’m interested in seeing your specimen if you dry it.

Very best,


Spore Print is White
By: John McDonough
2012-09-18 07:26:14 PDT (-0700)

That did not take long!

By: John McDonough
2012-09-18 07:24:21 PDT (-0700)

I carefully dug it up. Pictures of the remains of the volva have been added as well as measurement photos.
The remaining sac was hard and brittle and was found to be three inches deep in the clay soil.

Progression photos
By: John McDonough
2012-09-18 06:33:20 PDT (-0700)

Pictures have been added 24 hours from the first posting. As you can see the cap has fully matured and expanded, splitting and turning upwards, concave in the middle.
The color has turned to a dull brown/gray, radial lines at the margin are still visible.
the volva remnants that where white yesterday are now a tan/gray color and quite fragile.
Gills and stalk have taken on a slightly gray tone in color as well.
It is time I dig this one up to see what the base really looks like, get a spore print, and dehydrate for preservation.

I checked the Info you suggested Dr Tulloss
By: John McDonough
2012-09-18 05:03:23 PDT (-0700)

This specimen being located in the foothills of the Ozarks and not in the Louisianan coastal plain, along with the other descriptions given for sp-T44 I have my doubts that this one is sp-T44.
I will have another picture of it as soon as the sun comes up.
Thank you for your assistance so far!


What little I know about “sp-T44”"…
By: R. E. Tulloss (ret)
2012-09-17 22:56:13 PDT (-0700)

is posted here:


Maybe Pat Leacock at the Field Museum has a photograph of the original collection?

Very best,


Hello, John. [edited]
By: R. E. Tulloss (ret)
2012-09-17 22:50:13 PDT (-0700)

I noticed that you didn’t check the “hebarium specimen available” box. I suppose that means you didn’t keep a dried specimen backing up this observation. If you run across this mushroom again, it would be great if you would not only post the pix, but also dry the material (even take some notes on it if you have the time). Since I’ve only seen a single specimen of sp-T44, I can’t be sure that that’s what you have here. Could be…or it could be something different.

For my contact information see


If you’d like a booklet (as pdf) with some information about collecting and drying amanitas, contact me with your email address via the email feature of MO or via the above website’s “contact us” feature:


One thing that would help with pix of amanitas is to always get a nice clear shot of the base of the stem with any attached volva.

Very best,

Rod Tulloss

Good to see you here
By: Missouri Mycological Society Herbarium (MOMS_Herbarium)
2012-09-17 11:37:52 PDT (-0700)

You’ll get a lot of input here about observations — especially when you
propose a species. Actually, Dr. Tulloss (who named this species) is a
frequent contributor.

Good hunting,
Patrick Harvey

Created: 2012-09-17 11:35:09 PDT (-0700)
Last modified: 2012-09-25 08:55:54 PDT (-0700)
Viewed: 253 times, last viewed: 2016-10-20 15:06:41 PDT (-0700)
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