Observation 138666: Amanita recutita sensu Coker
When: 2013-07-05
No herbarium specimen

Proposed Names

47% (2)
Recognized by sight
54% (2)
Eyes3
Used references
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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I think more are needed.
By: R. E. Tulloss (ret)
2013-07-27 00:41:10 CDT (-0400)

And, if possible, it would be good to treat them as a possible unknown species and take as complete notes as possible as well as thorough photography. It would be interesting to see if the gills are always narrow and to measure the top-to-bottom breadth of the gills. You can see in the photographs on the Amanita recutita sensu Coker page on WAO that the gills of that species are sort of teardrop shaped. We’re scheduling the material that we currently have to be sampled for sequencing (Santiago Sanchez project).

Very best,

Rod

I am enjoying this
By: Justin (Tmethyl)
2013-07-26 23:55:14 CDT (-0400)

Such a wealth of knowledge.
One thing that stood out to me about these is their location.
In the photo’s it shows pine needles and Quercus leaves, but I just moved them there because they were growing in a sandy area in full sun, much too bright for photos.

They were in the open, about 30-40’ away from any trees, fruiting in sugar sand.
Bahia grass was present, nearest tree was a middle-aged Quercus virginianus.
I’m certain I can find more of these if needed.

Rats.
By: R. E. Tulloss (ret)
2013-07-26 18:42:45 CDT (-0400)

Amanita pubescens sensu Coker has gills that look just like those of recutita.

I’m starting to think we have something that has not been previously reported…

Very best,

Rod

Well, that little exercise probably eliminates cokeriana.
By: R. E. Tulloss (ret)
2013-07-26 18:39:12 CDT (-0400)

The original description of cokeriana indicates that its gill width is about the gill radius divided by 10. The gills of this critter are much narrower than that. We have DNA of recutita sensu Coker; so we can compare the present taxon to it molecularly as well as morphologically.

A big problem with cokeriana is nobody knows where the specimens are that Singer mentioned in the original description (protolog). Bah. Humbug.

OK. Then I think we have to go back to square one.

The DNA will be able to separate it from the Caesareae if I am mistaken about the stem base. Right now, we’ve split the dried specimen longitudinally and found the base of the stem is distorted. I feel comfortable thinking Caesareae, but it might be that there is a bulb in the distortedness. Then it would be in sect. Amanita. If that is the case, then a candidate is A. pubescens sensu Coker. (Yeah, Coker was one of the best amanita-guys of his day. But he never got a chance to come back and rework the genus as he hoped he would be able to do. So we have his great paper of 1917 and a few species named later.) Bas said that the best annotations on material he reviewed for his monograph on Lepidella were the annotations on Coker’s collections in Chapel Hill (at Univ. North Carolina).

So now I’ll take another look at A. pubescens sensu Coker.

R

Hmmm.
By: R. E. Tulloss (ret)
2013-07-26 18:09:54 CDT (-0400)

I just noticed something about these collections that differs from Amanita recutita sensu Coker. The gills are much narrower. The gills of A. recutita sensu Coker are so wide that they project well below the edge of the cap.

Soo… maybe we have something else here. There is something that Singer called A. cokeriana

I will go back to the books and website.

Very best,

Rod

You’re very welcome.
By: R. E. Tulloss (ret)
2013-07-25 10:53:01 CDT (-0400)

It was a really nice specimen.

Very best,

Rod

Exciting
By: Justin (Tmethyl)
2013-07-25 07:15:37 CDT (-0400)

Thank you both. I appreciate the update and am excited to hear all this wonderful news.
Things like this keep the motivation up high.

A few added comments.
By: R. E. Tulloss (ret)
2013-07-24 22:33:40 CDT (-0400)

Thanks to Naomi for all her efforts at maintaining herbarium accessioning going forward during this year of many projects for the Roosevelt team.

I’d like to add that this may be the first collection of recutita sensu Coker to be determined from Florida. The species has now been found on the east coast of the U.S. from Connecticut to Florida and westward to east Texas and central Oklahoma. It was originally described (under a misappliled name) from North Carolina. Everywhere it is associated with oaks…so far as I know.

It is a fascinating species of section Caesareae with very dense stem tissue that cuts like a soft wood.

See:

http://www.amanitaceae.org?Amanita+recutita+sensu+Coker

The cap color ranges from gray to white even at a single collecting site. Perhaps, the gray pigment fades due to rain or sunlight. The species is not commonly collected, although in Connecticut and Oklahoma single sites seem to produce year after year.

This collection will be scheduled for sampling for DNA studies.

Thanks, Justin.

Very best,

Rod

Thanks Justin,
By: groundhog
2013-07-24 14:42:46 CDT (-0400)

This specimen has been received and accessioned into Rod’s herbarium. Rod examined this material and concluded because of the large inamyloid spores, hollow totally elongating stem, saccate volva, and marginal striations that it was a specimen of species
A. recutita sensu Coker
-Naomi

The small limbate volva and powdery volval remnants on the cap suggest…
By: R. E. Tulloss (ret)
2013-07-05 10:49:07 CDT (-0400)

Amanita subsect. Limbatulae Bas.

We’d be interested in looking at this material if there is some available.

Very best,

Rod

Created: 2013-07-05 02:05:57 CDT (-0400)
Last modified: 2013-08-15 12:07:17 CDT (-0400)
Viewed: 79 times, last viewed: 2015-10-12 01:44:27 CDT (-0400)
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