Observation 168734: Amanita semiobruta Tulloss & Kudzma nom. prov.
When: 2014-06-29

Notes: Oak and hardwood forest.

Proposed Names

28% (1)
Eye3
Recognized by sight
ret
81% (1)
Eyes3
Based on chemical features: This material is the basis for the concept behind the provisional name.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
Skeletal page for this species available.
By: R. E. Tulloss (ret)
2016-12-27 10:43:34 PST (-0800)
Skeletal page for this species available.
By: R. E. Tulloss (ret)
2016-12-27 10:43:32 PST (-0800)
See also MO #168774
By: R. E. Tulloss (ret)
2016-12-23 21:22:36 PST (-0800)

Same species, I think.

R

Then I have a provisional name in mind for this material.
By: R. E. Tulloss (ret)
2016-12-23 21:13:31 PST (-0800)

Amanitasemiobruta” … meaning the “half-buried” or “half-hidden” ringless amanita. Of the group, this one is more of a milk chocolate color in the center of the cap than the others.

Thanks, again.

Very best,

Rod Tulloss

A member of
By: Jon (watchcat)
2016-12-23 18:31:56 PST (-0800)

The “penetratrix” group?

Yes sir. That is correct.
By: Jon (watchcat)
2016-12-23 18:29:02 PST (-0800)
From the images, it looks as though quite a large portion of the stem…
By: R. E. Tulloss (ret)
2016-12-23 15:32:52 PST (-0800)

was under ground. Is this correct, Jon?

Very best,

Rod

What I was trying to say in the comment I mangled…and deleted…
By: R. E. Tulloss (ret)
2016-12-23 13:55:24 PST (-0800)

was that the taxon represented by this page has a “proposed fungal barcode” (nrITS) gene that is closest to those of Amanitapenetratrix” among the sequenced species with an nrITS sequence in GenBank or in my personal database (which contains sequences not yet posted to GenBank). However, the previously known sequences of the cited species cluster closely together (in terms of similarity)…differing from each other by a few tenths of percent. The new sequence is not in the cluster.

When one compares the new sequence to sequences from “penetratrix,” the percent difference is 2 to 2.3 %. To use round numbers, 1 percent difference can be thought of as a difference of 6 of 600 characters in an ITS sequence.

Very best,

Rod

Since I haven’t mentioned penetratrix previously with relation…
By: R. E. Tulloss (ret)
2016-12-23 13:43:01 PST (-0800)

to this observation:

http://www.amanitaceae.org?Amanita%20penetratrix

The techtab of the above page is accumulating information about some genetically related taxa in the “discussion” data field.

Very best,

Rod

Thanks Jon,
By: groundhog
2015-06-23 14:00:27 PDT (-0700)

We have recieved this material and it has been accessioned to Rod’s herbarium. We are scheduling it for DNA sequencing.
-Naomi

Thank you, Jon.
By: R. E. Tulloss (ret)
2014-06-30 09:02:23 PDT (-0700)

R

I will send it with the other collection Dr. T. Jon
By: Jon (watchcat)
2014-06-30 08:52:48 PDT (-0700)
The reason that I asked about cap size….
By: R. E. Tulloss (ret)
2014-06-30 07:39:25 PDT (-0700)

I notice the extreme prominence of the umbo. We have found (rarely) in Connecticut a species with a very prominent and hard umbo. It reminds me the similar umbo that is present on some species of Termitomyces and seems to serve the purpose of perforating a hard-as-concrete termite mound. (The weird case of the animal whose food blows up it house.)

The amanita mentioned seems to arise from a very deeply buried primordium and has to come up a long way through the soil before it breaks the surface.

If you find Vaginatae with very acute umbos such as the one in your photos, I think you should assume that the base of the stem is very, very much farther down in the grown than you might think…in larger specimens, I think may have to excavate as much as 8 inches of substrate to find the base of the stem.

If you are finding material in this group, I really would like to see it. We have had terrible luck with drying the collections that we have found to date. In once case, somebody shut off the power over night and we lost everything in the dryer…including this deeply originating critters.

Very best,

Rod

about 3 inches Dr. T.
By: Jon (watchcat)
2014-06-30 07:17:55 PDT (-0700)
Yes, I’d like to see the material.
By: R. E. Tulloss (ret)
2014-06-30 06:38:38 PDT (-0700)

It is not something that I see commonly in my home collecting area.

Can you give me an approximation of (say) the width of the cap?

Very best,

Rod

Not sure but I have this specimen saved for you. Jon
By: Jon (watchcat)
2014-06-30 05:57:43 PDT (-0700)
Hello, John.
By: R. E. Tulloss (ret)
2014-06-29 21:14:31 PDT (-0700)

The stipe base seems to have suffered some indignities between the picture of the stipe in the ground and the picture out of the ground. It was clearly hard to get a nice clean extraction. It looks to me as though there are some bits of gray volva on the stipe in the stipe-in-ground photo…or do you think they are just soil?

Very best,

Rod

Created: 2014-06-29 18:28:05 PDT (-0700)
Last modified: 2016-12-26 22:10:45 PST (-0800)
Viewed: 113 times, last viewed: 2017-02-04 00:22:29 PST (-0800)
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