Observation 119465: Amanita pruittii A.H. Sm. ex Tulloss, J. Lindgr. & Arora

20+ fruit bodies growing in a pathway in a field, 250’+ from any trees.

Cap 2-5.5 cm across, stipe 0.5-1.2 cm across at apex, 0.7-1.7 cm at base.

Gills pale creamy when young, becoming yellowish in age. Odor nil when young, slight, disagreeable in age.

Proposed Names

-6% (2)
Recognized by sight
Alfredo Vizzini

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Debbie Viess (amanitarita)
2014-07-01 12:09:59 MST (-0700)

Can’t WAIT to see this published, and I’m pretty sure that I’m not the only one. Great job, all.

We do have a sequence from that collection.
By: R. E. Tulloss (ret)
2014-06-30 20:18:58 MST (-0700)

My mistake was to attach the link to MO to the wrong collection. That’s now corrected. Thank you.

Here’s the correction collection data from the Last Chance collection:

Santa Cruz Co. – Big Creek Lumberyard, Last Chance Rd., 20.xi.2011 C. Schwarz s.n. [mushroomobserver.org #138586] (RET 493-8, nrITS seq’d.)

I’m very sorry for the confusion.

Very best,


Maybe I’m misunderstanding
By: Christian (Christian Schwarz)
2014-06-30 20:02:55 MST (-0700)

your comment at the top of observation 138586
But it seems like you got usable sequence from that one as well.

Just now brought WAO up to date with regard to which pruittii collections have sequences.
By: R. E. Tulloss (ret)
2014-06-30 19:53:46 MST (-0700)

You can check to see if I’m right. These are the collections for which we have an ITS (using my herbarium accession numbers to indicate the collections other than the isotype):

343-2, 493-8, 077-6, the isotype in Leiden, 522-3, 522-8, 613-7, 521-6.

We have one collection from near Swanton collected by David Arora which is the collection with my accession number 077-6.

The collection data for 077-6 is:

ca. Swanton, 13.xii.1992 D. Arora s.n. (NY; L; RET 077-6, nrITS seq’d.).

All the other collections, with their geographic data, etc. are listed in the “materials examined” data field of the technical tab on the Amanita pruittii page on WAO:


I recall NOT studying at least one collection (maybe two) from Santa Cruz Co. because of very severe mold problems.

Very best,


By: Christian (Christian Schwarz)
2014-06-30 19:15:07 MST (-0700)

I thought you also got ITS from the Swanton Road collection from Santa Cruz?

You’re welcome, Noah.
By: R. E. Tulloss (ret)
2014-06-30 18:55:55 MST (-0700)

I don’t know where I could put my hands on such photos if I have them. They are not in my photo file system…at least they’re not categorized in the right spot.

I certainly would look at other images. Because of glare on the stipe of the mushroom on the left and because I wanted at least 200 dpi for the publication, I trimmed the shot you have on-line to contain only the mushroom on the right. The was a fairly good fit for the space I have available in the article. The reddish tone of the universal veil is what I want to show…because the picture of pruittii in standing water also has a reddish tint to the volva on the cap; all other (presumably dryer) fruiting bodies in other photographs available to me have volvas ranging from white to gray…without a red tinge.

Very best,


That’s great Rod,
By: Noah Siegel (Noah)
2014-06-30 18:32:28 MST (-0700)

Luckily enough of the collection was saved from the mold.

I believe I sent you other photos of this collection?

The magical chemistry man extracted DNA and… …..EDITED!
By: R. E. Tulloss (ret)
2014-06-30 18:16:18 MST (-0700)

sent us an ITS sequence for Amanita pruittii from Sacramento County, California. This is great. We have two photos that correlate a reddish color of the volva on the pileus with recent heavy rains and saturated soils. That’s cool.

I’d like to use your photo in the original description of A. pruittii.

We’ll see what other data your material can provide us as well.

Thanks again for send us some of this material.

Very best,


Fingers crossed.
By: R. E. Tulloss (ret)
2014-06-06 14:13:20 MST (-0700)

The species of subsection Vittadiniae suck up moisture and mold like crazy. We hope that we have created samples with minimal or no mold on them. We will see what can be done.

Very best,


Thanks Noah,
By: groundhog
2014-06-06 09:08:36 MST (-0700)

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

Very wet grassy area,
By: Noah Siegel (Noah)
2014-06-03 14:07:08 MST (-0700)

but not any standing water when I was there. It was in a river floodplain, about a week following a heave rain (5"+).

I remember getting wet knees and elbows taking the photos…

I wonder if you remember how wet the field was when you took the shot posted here.
By: R. E. Tulloss (ret)
2014-06-03 11:08:21 MST (-0700)

The reddish tint in the volva on the cap appears in photographs from Oregon taken when the mushrooms were watersoaked (standing in water of a flooded field.

Very best,


Thanks, Noah.
By: R. E. Tulloss (ret)
2012-12-12 08:37:29 MST (-0700)

As always.

I hope the foray fulfills everyone’s expectations and all have a great time. I also send my regards to Christian.

Very best,


By: Noah Siegel (Noah)
2012-12-12 08:27:29 MST (-0700)

Rod, When I get a chance I will send some of it to you. It was a new site, about 20 (plus a few more buttons coming up)

I’ll also email you better photos of it…

It was growing in a flood plain near the Cosumnes River in a really wet grassy area.

I will get more info to you after NAMA

I’m glad that you have the photos, too, Deb.
By: R. E. Tulloss (ret)
2012-12-10 09:04:05 MST (-0700)

The ones I’ve received were from forest service employess so they are public property. I’m planning to put them on WAO.

Growing in standing water…in a reflecting pool type situation.


very wet ground?
By: Debbie Viess (amanitarita)
2012-12-10 08:32:41 MST (-0700)

they actually grow in standing water up at Fern Reservoir, OR!

y’all can see photos of these at my amanita lecture for NAMA in Santa Cruz this week.

awesome Noah.
By: Debbie Viess (amanitarita)
2012-12-09 21:42:56 MST (-0700)

you rule.

There is a location in Oregon in which they have repeated for many years.
By: R. E. Tulloss (ret)
2012-12-09 21:12:20 MST (-0700)

The Oregon site will be the type locality when the species is published. The area is liable to flooding after heavy rains and I was just sent a picture of pruittii standing in the field (which acted as a reflecting pool).

There may be some affinity with flooding for some of the saprotrophic amanitas. Amanita prairiicola was first found in tall grass prairie after heavy storms. Amanita savannae was found in standing water in a flooded savannah in Colombia. I’ve seen prairiicola in desert in Arizona in the monsoon season at the edge of a wash that flash floods after monsoon rains in the mountains.


I found…
By: Douglas Smith (douglas)
2012-12-09 11:52:55 MST (-0700)

I found a good patch of these years ago, and I’ve been checking that spot every year since, and haven’t seen them again. Funny little saprotroph, I wonder if there are spots where it comes up consistenly.

Hi, Noah.
By: R. E. Tulloss (ret)
2012-12-09 11:09:35 MST (-0700)

I’d be interested to see part of your material. I understand there is great interest in keeping at least part of California collections in California. I would just need halves of a couple of mature fruiting bodies. I hope to have the species described in the next few months. It is interesting that you’ve found an apparently new site (?).

Very best,


Created: 2012-12-09 09:46:28 MST (-0700)
Last modified: 2017-12-28 17:45:48 MST (-0700)
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