Observation 142433: Amanita limbatula Bas

When: 2013-08-09

Collection location: Hunlock Creek, Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

Specimen available

From a corner of my property where several Amanita species have been collected over the years. Grassy path with small oaks nearby.



Proposed Names

-29% (1)
Recognized by sight
Used references: Amanita Studies
49% (2)
Recognized by sight
Used references: See comments.
82% (1)
Used references: Bas (1969) thesis.
Based on microscopic features: Spore shape cylindric, spores amyloid, clamps present.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
The voucher for this collection has been sampled; the sample has been sent for DNA sequencing.
By: R. E. Tulloss (ret)
2018-05-31 23:22:43 CEST (+0200)

Thanks, again, David. This is a cool one.

Very best,


There continue to be discussions and articles indicating that some sections of Amanita
By: R. E. Tulloss (ret)
2013-11-09 17:58:50 CET (+0100)

have experienced accelerated evolution of new species at certain times. The succession of ice ages in North America may play a role in this on our continent. When sea levels were low, it is very clear that the ancestors of many North American fungi have managed to travel with their plant symbionts over Beringia from Asia to the “new world.” Moreover, the windshield wiper effect of glaciations pushing symbiotic forest trees southward to Mexico and the Gulf Coast (into glacial refugia) and then allowing the forests to return north with their fungal symbionts…again and again may have a good deal to do the fact that relatively recent speciation (and, in at least one case, possible hybridization) is reported in phylogenic phylogeographic studies (the history of the movement of related genes…and their organisms…in time and space).


To my amateur eye….
By: Dave W (Dave W)
2013-11-09 17:20:55 CET (+0100)

the local Vaginatae seem perplexingly diverse. One is led to wonder about whether it is possible to witness evolution in progress, as opposed to just a snapshot of presently static species. I guess that’s part of what the DNA analysis is all about.

Sounds like an Amanita hot spot.
By: R. E. Tulloss (ret)
2013-11-09 17:12:46 CET (+0100)

This year produced some very interesting material from eastern PA and NJ…from regions where people have collected mushrooms for years. I don’t think it’s that we have learned more. It’s just that someone was in the right place at the right time and collected something…and then shared it by letter or email or MO.

This past year, I know I missed at least one species that showed up on MO over and over again when I was doggedly looking for lavendulas and rubescent taxa. The ones that I missed learning more about were all in section Vaginatae…a section that I’ve worked on since 1993 and which never stops surprising me with new taxa.

Very best,


Thanks for the detailed comments, Rod.
By: Dave W (Dave W)
2013-11-09 16:28:55 CET (+0100)

To my memory, this was the first time I have seen this type Amanita. The location features a few immature oak trees, so perhaps a mycorrhizal relationship is only beginning to show results. This corner of my property, about 4 square yards on a path, has also produced several sect. Vaginatae types and sp. 34 from sect. Amanita.

Hello, David.
By: R. E. Tulloss (ret)
2013-11-08 22:38:27 CET (+0100)

This material is the best match for Bas’ A. limbatula that I’ve ever seen. We used this material as a lesson on spore measurement and spore characters this afternoon; and we got a great payoff. We actually got an ID. This material will be used on the WAO site. If we can find someone to sequence lepidellas soon, we’ll try to get some DNA from this guy.

If you can find this lady again, we’d like to see some material (mature enough to make spores) that was dried fairly quickly after collection and proof of sporulation). I think we got slightly undersized spores on this round.

A cool find. This species was previously known for sure only from Long Island.

Very best,

Rod and Naomi

Hi Dave,
By: groundhog
2013-10-25 20:06:05 CEST (+0200)

This material has been recieved and accessioned into Rod’s herbarium. We are planning on examining it further (and possibly identifying it to the level of subsection).

You’re welcome, David.
By: R. E. Tulloss (ret)
2013-08-13 23:34:18 CEST (+0200)

I look forward to seeing this material.

Naomi put in a long day today. Starting tomorrow, Naomi will be posting status for collections that you, among others, have sent me (some are from last year or earlier). We are now trying to get everything we have formally accessioned in the herbarium. At the moment, new material is coming very rapidly; and we aim to keep up with it as best as possible. This year, with our somewhat restricted focus on species in section Validae, we are trying to move incoming material into the sampling queue as soon as we can. This means we can get back to folks such as yourself who are so generous as to send us their collections with status related to the DNA sequencing part of the Validae project.

The work load doesn’t let up; but the opportunity to learn from new colleagues and new experiences is delightful. We hope that we can pass some of this on through MO to you and the other folks who are really making a wide-ranging study of some interesting species possible in a period much shorter than it would take if I was hustling through all the states east of the Rockies myself trying to find the species on my list.

I appreciate everything that you and our other colleagues are doing for this project. I understand that Dr. Hughes’ latest paper on agaric hybrids is available on-line in a pre-publication format on the Mycologia site.

The paragraphs on “citrina var. lavendula” in that article are the tip of one very interesting iceberg.

Very best,


Hi Rod.
By: Dave W (Dave W)
2013-08-13 17:01:49 CEST (+0200)

I have preserved the material seen in this obs. Eventually, I’ll mail it to you along with the next accumulation of dried amanitas.

I see what you mean about the spores. The most elongated ones in the photo show Q~2.2, with most of them just a bit over/under 2.0. As always, thanks for the info.

Hello, David. EDIT EDIT
By: R. E. Tulloss (ret)
2013-08-12 19:47:32 CEST (+0200)

I looked at your spore photograph and don’t think that the spores are narrow enough for longipes. The overall average Q (my Q’) for (EDIT) longipes is between 2.20 and 2.30; and you will often find a few spores that are three times as long as they are wide. I would very much like to take a look at this material if you happen to collect and dry it in the future.

Very best,


Created: 2013-08-12 17:43:46 CEST (+0200)
Last modified: 2018-05-31 23:22:44 CEST (+0200)
Viewed: 366 times, last viewed: 2018-07-23 21:45:18 CEST (+0200)
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