Observation 138727: Amanita nauseosa (Wakef.) D.A. Reid

When: 2013-07-05

Collection location: Ocala National Forest, Marion Co., Florida, USA [Click for map]

Who: Justin (Tmethyl)

No specimen available

Growing under cedar trees, no oaks or pines within 80ft.
GILLS smell of light ammonia. Much like cat urine, but less noticeable.
The pileus does not have a scent.. only the gills.


By the way Suchen, I was wrong, there was no grass.

Proposed Names

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Erlon (Herbert Baker)
2014-06-24 13:54:09 PDT (-0700)

Thanks, Rod. I suppose I should have looked there first. :)

Bas suggested that praegraveolens might be a synonym of nauseosa.
By: R. E. Tulloss (ret)
2014-06-24 11:54:30 PDT (-0700)

Hence, I had a very good clue. The nomenclatural information on nauseosa and the list of materials that I examined in verifying Bas’ views and extending synonymy to another name are listed on the technical tab here:


The epithets “malodora” and “praegraveolens” and “ingrata” all seem to me to be taxonomic synonyms of nauseosa. On the above page you can see the spore measurements that I got from each of the sets of “orginal material” that I was able to review holotype or isotype and other collections cited in the original descriptions (paratypes).

Also you will note that the shape of the spores of nauseosa is rounder in rainier climates (including human-watered botanical gardens).

Very best,


By: Erlon (Herbert Baker)
2014-06-24 11:28:59 PDT (-0700)

Thank you. I imagine you have compared with Amanita praegraveolens, hence the deprecation here.

I use the Wakefield name because it was exported from the Caribbean to Kew , …
By: R. E. Tulloss (ret)
2014-06-24 11:17:44 PDT (-0700)

where it was found in a greenhouse of tropical plants. It does not occur in the wild in Europe. It has been found in the Edinburgh Botanical Gardens as well as at Kew. I have made a study of many collections of A. nauseosa including Wakefield’s type from Kew and the beautiful collection that Reid made many years later in the botanical garden (which includes a button having an extra layer of universal veil that is missing in most other material. The morphology is identical to material from coastal regions of the U.S., Mexico, and some Caribbean island localities.

Although it has been reported from Australia, DNA shows that what what was found in Australia is quite close to A. manicata sensu Tulloss (which seems to have been exported to a number of diverse locations on earth) and not to nauseosa.

Very best,


A. nauseosa
By: Erlon (Herbert Baker)
2014-06-24 09:51:23 PDT (-0700)

Why are we using the European name Amanita nauseosa for American Material? What happened to Amanita praegraveolens (Murrill) Singer?

Thanks Justin,
By: groundhog
2013-07-24 11:48:09 PDT (-0700)

This material has been received and accessioned into Rod’s herbarium.

By: Justin (Tmethyl)
2013-07-10 13:06:22 PDT (-0700)

Some things I discovered today, very exciting things.

Firstly, they make fairy rings!
I discovered 5 fairy rings today, all very close to each other, all with A.nauseosa pins, mature fruits and very old fruits.

So I sniffed them all!

Only the more mature fruits stink.

The pins and the fruits that are fully mature but still fresh, barely have a scent.
The old nearly dry degraded fruits… wow, that’s a powerful stink.

Lastly, they are certainly NOT mycorhizal, the fairy rings I discoverer today were a thousand feet or mote away from the nearest tree. Just grass.

By: Justin (Tmethyl)
2013-07-09 06:54:32 PDT (-0700)

Your package should be arriving today or tomorrow it contains about 10 species you’ve requested specimens for over the last 2-3 months. Let me know if you receive it.

Also, sadly, I had made a special package for you decorated with all sorts of Amanita spore prints but not all the collections would fit so I was forced to use a different package. I thought it would be neat to use the USPS as a spore dispersal agent, and the white prints were rather tasteful and stylish.

But alas, my plan failed, this time.

If there is anything else I should do differently with future specimens please let me know.

it does smell Rod
By: Justin (Tmethyl)
2013-07-06 08:54:24 PDT (-0700)

Like ammonia or cat urine, but you have to have your nose basically touching the gills to notice it.

Myke is truly a hero for his deed, I second that.

I look forward to your interrogation of this collection.

Mykes Logos is a hero. EDIT EDIT
By: R. E. Tulloss (ret)
2013-07-06 08:38:19 PDT (-0700)

Sucking in air from a nauseosa specimen…


We had a very interesting goldish medalion to send to you, but it was swiped by future aliens and is now appearing (inexplicably) on recent episodes of “Defiance” on the SyFy channel. Sorry, it would have looked great around your neck or draped over the coffin of your vacuum pumping electric sealer.



By: R. E. Tulloss (ret)
2013-07-06 08:30:58 PDT (-0700)

I never heard of a non-smelling nauseosa. I guess I’ll wait to look at the stem and gills to see if this is an Amanita. Maybe Dr. Else Vellinga, “Empress Macrolepiotaceous,” could take one look and save me a lot of trouble.

In either case (nauseosa or Macrolepiota) the mushroom is not, or very probably not, mycorrhizal.


thats interesting
By: Justin (Tmethyl)
2013-07-06 07:20:59 PDT (-0700)

Because the ammonia smell on these (fresh and dry) is hardly noticeable, even with them directly under your nose. Maybe this collection is similar, but a different species than yours and Suchens finds.

By: Benjamin Dion (benjamindion)
2013-07-06 06:36:21 PDT (-0700)

How gross were these? They smell and taste horrible…

My vacuum-sealer broke about 2 days before I found these down here, and I had to suck the air out of the bag with my mouth and then seal it before I sent it to RET… it was so disgusting. lol

Even more interestingly
By: Josh M.K. (suchen)
2013-07-06 05:51:59 PDT (-0700)

they probably don’t have any mycorrhizal partner at all! Blew my mind when Dr. Tulloss first told me that.

I will make sure it’s double sealed.
By: Justin (Tmethyl)
2013-07-06 04:51:23 PDT (-0700)

I like when Tulloss says “woah” that’s a good sign.

Do you think it’s possible these are mycorrhizal with that cedar tree?

Remember nauseosa will suck water out of the air like crazy after…
By: R. E. Tulloss (ret)
2013-07-05 21:19:21 PDT (-0700)

you’ve dried it. Seal it up as tight as you can after you’ve got it as dry as possible.


Very best,


I hope you are right, because that is probably one of the best photos of the cap surface…
By: R. E. Tulloss (ret)
2013-07-05 21:17:57 PDT (-0700)

that exists. If that is nauseosa you can see the radial structure of the universal veil very clearly especially in the full-size version of the image. There even looks like there may be remnants of an outer layer of the volva that have been reported previously (but that I have only seen in dried specimens). So I hope you are write. The decoration and staining of the stem fit with nauseosa.

Cross fingers.

I’m looking forward to the material.

You guys in Florida are having one crazy season.

Very best,


Picture added Suchen
By: Justin (Tmethyl)
2013-07-05 19:15:51 PDT (-0700)

I was wrong, there was no grass, just vines.

The stipe looks
By: Josh M.K. (suchen)
2013-07-05 19:09:14 PDT (-0700)

the same as the A. nauseosa I have found before, however the cap looks markedly different. Fascinating.

4 very good, quickly, properly dried and stored specimens.
By: Justin (Tmethyl)
2013-07-05 19:00:20 PDT (-0700)

Do you think the proposal is accurate?

No specimen?
By: R. E. Tulloss (ret)
2013-07-05 18:58:05 PDT (-0700)

Very best,


Just a guess
By: Eric Smith (esmith)
2013-07-05 18:24:54 PDT (-0700)

You may be right.

Macrolepiota have clean white spores?
By: Justin (Tmethyl)
2013-07-05 18:20:42 PDT (-0700)

I was thinking Amanita.. but I’ve never seen anything like this until today.

Created: 2013-07-05 18:06:32 PDT (-0700)
Last modified: 2013-07-06 05:53:31 PDT (-0700)
Viewed: 168 times, last viewed: 2018-03-22 04:03:12 PDT (-0700)
Show Log