Observation 204747: Amanita insinuans Tulloss & Kudzma nom. prov.

Medium-sized Amanita sp.. Closest tree is pecan. I was unable to extract a specimen with an undamaged volva. As far as I can tell, the volvae on this species is pretty unsubstantial and does not adhere very tightly to the stipe. Also, for what it’s worth, this species seems to issue up from the depths; a good quarter of the stipe requires excavation. Whispy, delicate annulus melded to stipe.



Proposed Names

47% (2)
Recognized by sight
91% (2)
Based on chemical features: The voucher for this observation is the basis for forming the species concept of A.insinuans”.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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By: R. E. Tulloss (ret)
2017-06-02 12:35:48 PDT (-0700)
(R. E. Tulloss) Herbarium Rooseveltensis Amanitarum additional data on your material
By: mcmacher
2017-06-02 12:14:12 PDT (-0700)

Rod found that 40 spores from your material measured (9.0-) 9.8 – 13.0 (-15.0) × (6.3-) 6.4 – 8.4 (-9.6) μm. The shape of the spores is conveyed by the range of the spore length divided by the spore width. The ratio of length to width of a spore is called “Q”. The range of Q for your material is Q = (1.23-) 1.41 – 1.71 (-1.77). Spores with Q value between 1.3 and 1.6 are ellipsoid spores. Spores with Q between 1.6 and 2 are elongate. So, your spores are ellipsoid to elongate and infrequently broadly ellipsoid (Q between 1.15 and 1.3). The following are additional facts about your spores: hyaline, colorless, smooth, thin-walled, inamyloid, ellipsoid to elongate, infrequently broadly ellipsoid, adaxially flattened; apiculus sublateral, cylindric; contents as large irregular guttules, sometimes with additional granules; ?? in deposit.

The length of the stem suggests to be that the mycorrhizae…
By: R. E. Tulloss (ret)
2016-12-26 17:06:30 PST (-0800)

are down where available root hairs are and these are pretty far down in the soil. In the Coast Plain, a lot of trees have evolved away from having root hairs near the surface where they could be damaged by fire. Amanita (and probably other mycorrhizal fungi) can hangout with these trees if they can live with mycelium sharing the depths of the places were ectomycorrhizae can form. I’m used to seeing long roots in these ecosystems that lose water through sandy soil very rapidly.

very best,


By: Logan Wiedenfeld (LoganW)
2016-12-26 14:17:34 PST (-0800)

Besides the pecan, there’s a big live oak thirty or so yards from where these were picked. That’s about it, though. These tend to grow at a distance from even the pecan. If I didn’t know any better, I’d peg these as saprobic.

By: Logan Wiedenfeld (LoganW)
2016-12-26 13:56:13 PST (-0800)

I’m almost certain the above observation corresponds to the same critter.

The question of the nature of the partial veil is an open issue. It would be of interest,…
By: R. E. Tulloss (ret)
2016-12-26 12:12:23 PST (-0800)

if you could check some unopened specimens to see if where the “partial veil” originates. Is it marked radial lines? Did it originate at the top of the the stem? Or is it a piece of the gray and collapsing/fragmenting volva that moved up the stem from a position near the base during the stem’s expansion?

Very interesting to me.

Very best,


Well, that is one fancy piece of work. In your backyard, eh?
By: R. E. Tulloss (ret)
2016-12-26 12:11:28 PST (-0800)

What other trees are present in addition to pecan? Pecans are in the genus Carya (Hickory); so they are could be symbiotic with an Amanita. What other trees do you have in the area?

Very best,


By: Logan Wiedenfeld (LoganW)
2016-12-26 11:19:13 PST (-0800)

is fascinating and exciting news!

As for the umbo, you’re right. This species tends to have an inconspicuous umbo, particularly in younger material.

This species pops up like clockwork in my yard late spring. I shouldn’t have any trouble documenting it better come spring time.

This species seems to have a less pronounced umbo than do other related…
By: R. E. Tulloss (ret)
2016-12-26 09:10:39 PST (-0800)

species such as Amanitapenetrans”, A.penetratrix”, and A.semiobruta”. Or is the mushroom shown from the top just an older specimen of a species that has an abrupt umbo when young?

Very best,


The proposed name means “penetrating”.
By: R. E. Tulloss (ret)
2016-12-26 08:29:19 PST (-0800)

In this case, the name refers to the movement of the cap during expansion of the fruiting body that originates deep in the earth.


Yes, I think the species is undescribed.
By: R. E. Tulloss (ret)
2016-12-25 08:55:15 PST (-0800)

It is cool to find yet another such species.

There are now over 330 such species listed on the www.amanitaceae.org website. So it is a major project to deal with them…especially when we know that we are very far from finding them all. Every time we get new sequences we discover several things: There are more new species; the gene sequences in common use are not always very good at segregating some species (for several reasons); and there are many technical and methodological problems to address.

At my age, the question becomes more and more of what is the most valuable use of my time. There are some people who believe they have the idea of the one thing that I should do…or the one area in which I should focus.

I have not found the matter a simple one to decide. At present I think it is important to serve both the scientists using the (now) traditional sequences for purposes of biodiversity and ecological surveys. This is what you might call the base market for genetic data. I don’t feel I should abandon that market. That means I should be releasing as many “named” DNA sequences as possible to GenBank.

On the other hand, there is a second, somewhat shifting market for DNA data. This market involves people working on phylogenetic hypotheses (evolutionary best historic guesses) and phylogeography (the hypothetical history of the movements of genes, groups of genes, or genomes around the world), or the general study of genomes and their history, etc. (For example, did you know that mycorrhizal amanitas did not (all?) evolve the ability to digest a plant’s glucose on their own. A goodly number borrowed the needed “equipment” from a bacterium or bacteria.) The researchers in these areas are stretching the subject matter of mycology. Much of it is involved with testing new algorithms that are proposed to solve existing problems or open new areas of study. In this large area of research, the theory is not at all limited to mushrooms; however, at least as a by-product of the research various organizations and structures are given to mycological data that are challenging to mycological taxonomy.

I think I have to be involved in all of this at the moment. If I hadn’t been widely involved, I wouldn’t have had the contacts and colleagues, the learning experiences, and the knowledge to help organize a response to the proposed splitting of the genus Amanita. Something that I think was very important for me to do. (The paper is accessible on my “page” on researchgate.net .)

A lot of philosophical typing for Christmas Day. Best wishes to you and those who read this email…including a safe and productive 2017.

Very best,

Rod Tulloss

Rod -
By: Logan Wiedenfeld (LoganW)
2016-12-25 06:39:57 PST (-0800)

Yes, these fellas require excavation. At least a third of the stipe is buried.

Are you suggesting, then, that this taxon is undescribed? If so, cool!

The images of several basidiomes side by side, show dirt about half way up the stem.
By: R. E. Tulloss (ret)
2016-12-24 17:00:37 PST (-0800)

Am I reading that correctly?

We just got a big shipment of DNA sequences including sequences derived from the voucher collection for this observation. They support the present species being in section Vaginatae; however, it is not closely related to anything for which a sequence has been deposited in GenBank. Certainly not with regard to the nrITS sequence (“proposed fungal barcode”). Its difference from the closest “matches” ranges from 13.9 to 17.7%. Well, somehow its relatives have not been posted in GenBank. (It happens, … even in Louisiana, I guess.) A nrLSU sequence over 1400 characters long had “best matches” 4.5-7.5% different. These matches are not close matches. This mushroom is something at a distance from other known amanitas from section Vaginatae.

For those following the Vaginatae with nrLSU sequences beginning with the unusual “TCT…” motif, this is another one.

Thanks for sending this very interesting material.

Very best,


Thanks Logan,
By: groundhog
2015-06-05 09:51:33 PDT (-0700)

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

Observing the amount of stipe inserted in the soil is a very useful thing to do.
By: R. E. Tulloss (ret)
2015-05-21 10:18:18 PDT (-0700)

Also, the fact that the volval sac is not firmly attached to the stem is a useful observation.

If you can spare some of this material, I would be very interested to examine it.

Very best,


Created: 2015-05-21 09:36:50 PDT (-0700)
Last modified: 2017-12-28 11:52:50 PST (-0800)
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