Observation 21222: Amanita tuza Guzmán

When: 2008-07-20

Collection location: Jalisco, Mexico [Click for map]

Who: Benito A. A. (Benito Aguilar Arana)

No specimen available



Proposed Names

-57% (3)
Recognized by sight
Used references: Audubon Field Guide
42% (3)
Recognized by sight: insufficient detail for a firm ID, but robust stature and faintly visible raised striate margin reminds me of this edible Mexican species. NEVER eat an amanita from a blurry photo ID, tho!
-40% (4)
Used references: Ret

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I await the clearly photographed stipe base…
By: R. E. Tulloss (ret)
2009-05-25 11:22:08 CDT (-0400)

Yes, that’s what I await…the very, very, very, very bottom.


Benito also sent me another group of photos of this species…
By: Debbie Viess (amanitarita)
2009-05-25 11:19:21 CDT (-0400)

in fact he has now posted them here (last photo in series) which show cream-colored gills and a hollow stem, stuffed with cottony pith. I’d say this is definitely a tuza. And all of the cap photos showed those short striations that are mentioned in your species description of tuza, Rod.

Still Benito, please be careful if you decide to try these as an edible…you want to make sure that all of the necessary features are in place and spend a few seasons collecting them and looking at the morphological variety within the species. I understand that Mexico has more than one species of deadly white amanitas/destroying angels…

The latest image…44313…suspense continues…
By: R. E. Tulloss (ret)
2009-05-25 11:18:48 CDT (-0400)

The specimen on the right has substrate material on the end of the stipe, but it still doesn’t look the bottom of an Amanita stipe. Notice the variation in the shape of the short gills in the specimen on the left. Gills look like they were narrowly connected to the stipe. I hope we can get a picture of the bottom of the stipe with whatever elaboration there may be…


The latest photograph doesn’t look like a member of the Phalloideae…
By: R. E. Tulloss (ret)
2009-05-25 01:59:40 CDT (-0400)

Whoa. Those are substantial striations…in image 44312.


so what I am hearing, Rod…
By: Debbie Viess (amanitarita)
2009-05-24 18:11:41 CDT (-0400)

is that it really could be either of these mushrooms.

I definitely see short striations at the caps edge (which could be true of either species with age, but more likely with a member of the caesarea), and there is no way to tell whether it has a bulb or not; in fact, if the exposed soil at the base of that first photo is closely covering and mimicing the shape of the volval sac, then I’d say that it really is a tuza that we have here…looks like a large loose volva with an inner limb to me…maybe. But not a good enuf ID to make it dinner!

striate cap & more…
By: R. E. Tulloss (ret)
2009-05-24 16:02:12 CDT (-0400)

Amanita tuza has striations that are shortish, but but quite distinct once the pileus is open. It has a saccate volva like that of Amanita calyptroderma (yellow form). The name tuza is a local name for a ground squirrel that pops up out of the ground very quickly. Supposedly, this Amanita_ comes out of the ground “fast,” also. Amanita tuza has an egg-shaped cap at first according to my memory of the drawing in the original description…but WARNING…my memory is not so good sometimes.

The picture shows the short gills being truncate, but A. bisporigera is one of the exception species (has amyloid spores and truncate short gills); so the short gills won’t help one way or the other.

Very best,


since we can’t see the volva or whether there is a bulb
By: Debbie Viess (amanitarita)
2009-05-24 12:02:46 CDT (-0400)

what other visible macro characters might make it section phalloides?

does the veil tissue in tuza always adhere to the cap, or can it sometimes be removed thru aging? age could, of course, also be responsible for the striations that I can barely see in these photos…

I think the species could belong in section Phalloideae…
By: R. E. Tulloss (ret)
2009-05-23 22:22:48 CDT (-0400)

Here is a web reference for a very brief description of A. tuza:
< http://eticomm.net/~ret/amanita/species/tuzash.html >. It usually has one or two large patches on the cap. I think the species is more likely to be A. bisporigera or one of the other white, amatoxin-containing species of Amanita sect. Phalloideae. Amanita virosa is restricted (with few exceptions) to Europe. In the New World, A. virosa is known from association with possibly imported trees on an estate in Virginia (demonstrated by DNA sequencing). There is some question over whether the common white member of the Phalloideae in Mexico is really the same as A. bisporigera of eastern N. America.

Very best,


Unfortunately this are only pictures I have
By: Benito A. A. (Benito Aguilar Arana)
2009-05-23 17:39:38 CDT (-0400)

I can not find any info about amanita tuza.

a sharper photo and volva details would be useful for ID.
By: Debbie Viess (amanitarita)
2009-05-23 10:20:09 CDT (-0400)

Created: 2009-05-23 02:18:48 CDT (-0400)
Last modified: 2010-09-14 18:26:14 CDT (-0400)
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