Observation 97626: Amanita sect. Lepidella sensu Bas
When: 2012-06-17
35.8° -85.6346° 274m
No herbarium specimen
0 Sequences

Proposed Names

28% (1)
Recognized by sight
-81% (1)
Used references: See comment, below.
54% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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I’m inclined to this of flat stipes as “accidents”….
By: R. E. Tulloss (ret)
2012-07-24 14:07:19 CEST (+0200)

which you might say is a prejudice after years of collecting and determining. Prejudices (apparent or real) should be tested. I hope someone will do that some day….


great information -thanks for sharing
By: Steve Roberts (Mushroom World)
2012-07-24 06:43:15 CEST (+0200)

We are all grateful for you meticulous work and dedication. Of course, we will keep our eyes out for this species on future club forays, get a quick spore print, and cut it and dry it as suggested. Recognizing it as Amanita “sp-TN01" in the field might be a bit of a challenge, especially with dozens of competing specimens of varying shapes, colors and sizes collected (hundreds of specimens on a good day) at a given foray.

Did you ever make a determination about the flat stipe -if that was an accident of nature, or if it might be a character of this species? That is one thing that really stood out to me as being quite unique.

Well, this is a real gem. [edit]
By: R. E. Tulloss (ret)
2012-07-24 01:35:27 CEST (+0200)

I got to do a little more work on this today. Say hello to Amanitasp-TN01.” I can’t find any described taxon that fits well with the macro- and microanatomy of this mushroom.

The best match for a combination of spore size-shape, presence of clamps (hard to see…so far in this material), and a deeply areolate cap is Amanita altifissura described by Dr. Jenkins in 1979. However his species is described as having a white cap split down into the flesh with dark brown irregular warts on the tops of the hills of split cap flesh. He describes the cap as having a thin pileipellis (skin).

I have not been able to find a skin on this species’ cap. The “splitting up” on the upper cap (up to the time the cap was dried) was entirely taking place in the volva which is very, very thick and composed of rather thick-walled, brownish cells. As in altifissura, the inflated cells are accompanied by plentiful hyphae and have no obvious order (e.g., they are not organized in vertical chains). The volva seems to transition directly into the cap flesh in which the inflated cells (acrophyslides) are are not pigmented.

This sort of very thick volva transitioning directly into the cap flesh reminds me a little bit of the West Coast species A. magniverrucata, which has been posted on MO several times…if memory serves.

I found several “giant spores” on the dried specimen…probably indicating (as is confirmed by the photos) that the species was just getting started with sporulation when it was collected and dried.

So, for the moment, although sharing some characters with the apparently very rare southeastern U.S. species A. altifissura, the present species seems to be different in a few characters.

And, of course, my observations need to be repeated and confirmed.

If the species is found again, it should be collected, checked for a spore print as quickly as possible, then cut vertically in (say) four slices (so that it will dry as quickly as possible), and dried…as quickly as possible. The hope is that this procedure will preserve delicate tissues in the gills a little bit better than they were on this first try.

For the time being, we’ll begin to work up a page for “sp-TN01” on WAO.

I very much appreciate the chance to look at this material. I hope you can find more. Congratulations to all who participated in the process leading up to this MO posting and since.

Very best,


Well, that’s a kindhearted way to put it.
By: R. E. Tulloss (ret)
2012-07-12 05:10:24 CEST (+0200)



Thanks for looking at the material…
By: Steve Roberts (Mushroom World)
2012-07-12 04:48:27 CEST (+0200)

Sounds like another one of those “Mystery Amanitas.” Sometimes I get lost in the world of Amanitas (and Boletes and Cortinarius and Crepidotus …and so on…) -makes me feel at least a little better knowing I’m not alone. However, I feel confident your not lost, only searching!

After examination of the volva on the pileus [critical edit affecting meaning]
By: R. E. Tulloss (ret)
2012-07-11 21:45:34 CEST (+0200)

This species cannot be placed in subsect. Vittadiniae Bas, which eliminates the possibility that this species is A. hesleri. The tissue of the warts on the cap is almost entirely composed of globose or subglobose or broadly ellipsoid cells and definitely not composed of chains of elongate cells.



Thanks, Steve.
By: R. E. Tulloss (ret)
2012-07-07 17:33:22 CEST (+0200)

The dried material arrived today at the Roosevelt P.O.


Thanks, Steve.
By: R. E. Tulloss (ret)
2012-06-19 10:20:56 CEST (+0200)

Those measurements are in the ballpark for A. hesleri.


Spore measurement
By: Steve Roberts (Mushroom World)
2012-06-19 06:56:42 CEST (+0200)

Rod, I know you will want to get precise spore measurements when you receive the spore print and dried material, but I have some preliminary measurements for you now:

10-13(14) x 6-7(8)µ

-Steve R.

Volval material on cap is turning darker
By: Steve Roberts (Mushroom World)
2012-06-18 07:47:01 CEST (+0200)


The volval material on the cap is definitely turning dark with age. The white areas of the cap have turned from whitish to gray. Other areas on the cap are turning brown to dark brown to dark gray.

I had the cap on a card with a whole in it and the stem in a glass getting a (successful) spore print. The weight of the stem and bulbous base caused the stem to separate from the cap -a pretty clean cut!

I’ll dry the stem and cap and send them to you along with the spore print.

Thanks for helping out!

Steve R.

Jay contacted me and reported that he had been leaning toward A. hesleri also.
By: R. E. Tulloss (ret)
2012-06-18 06:16:54 CEST (+0200)

So I changed my naming suggestion to A. hesleri.

I now owe Jay enough coffee to float him out to sea.


Flat stem, etc.
By: R. E. Tulloss (ret)
2012-06-18 05:10:30 CEST (+0200)


I’ve seen flat stems on quite a few different species in different sections. I’m not sure if they all have a common cause or what that cause might be.

I’d be very interested in the specimen. I always like to put out ideas in case folks posting on MO want to try the microscopy. I’m glad that you have gotten a spore print from it.

I’d give a half-cup of coffee to know what Jay is thinking about this critter. I have an idea myself (partially gave it away in the request for info on the volva—I was referring to the mountain range of volval material on the cap). Thanks for insisting on more precision on that point.

I’m thinking that this might be one of the species in Amanita subsect. Vittadiniae Bas that occurs in forests rather than grasslands. There aren’t very many of these. I’m thinking this might be A. hesleri Bas.

Particularly check image no. 1 on the brief tab of this page:


This is a cool specimen.


By: Steve Roberts (Mushroom World)
2012-06-18 04:26:15 CEST (+0200)

I have this specimen and have been enjoying it the past 24 hours. Sent several pictures to Jay J. last night, who was equally impressed. One thing that intrigued me is the very flat stem, all the way from the base to the cap. Have you ever seen Amanitas with flat stems, or do you think this might be environmental, as Jay suggests is possible?

I am getting a successful spore print. I also have nice several pictures -also on blue background (oh boy!) I am sending these pictures to Christine to post here. Maybe then you can observe the flat stem phenomenon I’m talking about.
I’d be happy to comment on your questions about any volva color changes, but first I need a little “Amanita 101.” By volva, do you mean remnants on the basal bulb or are you talking about remnants on the cap?

I have a microscope, but the microscopy you’re requesting may be a little over my head.

If this is a specimen you’d like to study, I’d be happy to dry it and send your way.

-Steve R.

By: Martin Livezey (MLivezey)
2012-06-18 01:14:00 CEST (+0200)

Thanks for the insight. I will keep my eye on the annular zone of any sect. Lepidella I am lucky enough to spot. Nothing like that here yet – although I did see a rotten A. amerirubescens…,

By: R. E. Tulloss (ret)
2012-06-17 21:26:39 CEST (+0200)

Yes, I am assuming that it is material from a “flocculent annular zone.” If there were foreign hyphae intermixed, I would not be able to detect it with the naked eye. On the other hand, in 35 or so years I’ve never seen Hypomyces on a specimen of sect. Lepidella. On a third hand, that doesn’t mean it couldn’t happen.


Can I butt in?
By: Martin Livezey (MLivezey)
2012-06-17 21:15:52 CEST (+0200)

Just a question – in photo #2, is that fuzzy stuff purely partial veil or hypomyces? As it is young my guess is that you are assuming this to be veil, right?

W-O-W… [edited]
By: R. E. Tulloss (ret)
2012-06-17 20:53:34 CEST (+0200)

I think the deep blue background is playing with the foreground colors. I’d suggest a simple medium gray without any tints of other color. There is something called a “photo gray” background color which will serve you well if you can obtain it or approximate it. Blue backgrounds can really make unsubtle changes in apparently subtle foreground colors.

This is a very interesting specimen. Can you tell me if the volva seems to be significantly darkening with age? Is the color a pale gray or a brown gray or a gray brown? Both color show up in the photographs of what appear to be the same part of the volva. Since I know you have a scope, I wonder if you could get a bit of volva from below the surface of a wart (maybe a thin, vertical section) and see if the inflated cells of the volva are dominated by (probably vertically arranged) chains of roughly sausage shaped cells.

I think it is too young to be making spores at this point.

What I’m trying to do is (mentally) work backward from mature material that I know to what they would look like at the stage of development you are depicting in your photos of this observation.

The section is surely sect. Lepidella.

Very neat find.


Created: 2012-06-17 20:20:36 CEST (+0200)
Last modified: 2012-07-11 21:45:55 CEST (+0200)
Viewed: 362 times, last viewed: 2017-06-13 10:26:40 CEST (+0200)
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