Observation 136989: Amanita radiata Dav. T. Jenkins
When: 2013-06-19
No herbarium specimen

Notes: Appeared to be fruiting along the margin of a crescent-moon-shaped fairy ring.

Proposed Names

56% (1)
Recognized by sight
60% (2)
Recognized by sight: Reminiscent of A. brunnescens. Reddish-brown staining. What trees were these growing near?
ret
81% (1)
Eyes3
Used references: Jenkins’ original description and http://www.amanitaceae.org?Amanita+radiata
Distinctly striate cap margin, disappearing partial veil, brown pigment on cap seems to be in radial fibrils, brown staining white stem, rather thick submembranous volva fragments left on cap, etc.
Based on microscopic features: amyloid spores, elongate to cylindric.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
Rod
By: Justin (Tmethyl)
2013-07-26 16:53:09 EDT (-0400)

This is becoming more fun every day.
I will certainly get very detailed shots and descriptions based on your information once I find these again, though I’m quite convinced these are an annual fruiter and I wont see them until late spring or early summer next year. It seems they fruited at the first heavy rain during warm weather, and multiple heavy rains have passed yet they won’t fruit again, I have 2 collection locations for these which have been producing nothing since I found them.

If more fruit I will know.

However I’m pretty sure I have more photographs of these and some from the other collection site. I’ll let you know asap.

I do need a workbook.

Thank you sincerely again for the amazing work and detailed information . This is what its all about.

Sooo…
By: R. E. Tulloss (ret)
2013-07-26 16:34:10 EDT (-0400)

If you find more of the species shown in this observation, it would be really important to know if the striate cap margin appears on ALL the mature specimens or just on some of them. Are the caps ever mostly “silvery white” with just a tan center? In other words, it would be very helpful if you could get pictures that would show the very few characters that are supposed to separate media and radiata from each other. Can you find characteristics of BOTH species in a SINGLE collection from your site? Or NOT?

http://www.amanitaceae.org?Amanita+media

http://www.amanitaceae.org?Amanita+radiata

I am not so concerned about confusion with A. neoneglecta now because its partial veil is supposed to be in pyramidal warts on the cap and completely friable on the stem base. Moreover, the partial veil is supposed to be superior (rather than apical) and quite persistent. I posted the protolog data for neoneglecta on WAO today.

http://www.amanitaceae.org?Amanita+neoneglecta

Your collection motivated the expansion of two pages on WAO to be more helpful to you…and to the next folks that pick up radiata or media. If the two names are taxonomic synonyms, then the older name will be the one to use, and that is media. Let’s see what we can find out.

I really appreciate your rediscovery (at least from my point of view) of this species and you cooperation.

You may have noted that you collection is now included with spore data on the radiata page.

If you don’t know about it already, you can keep track of what is changing on the WAO site on this page:

http://www.amanitaceae.org?Site+news

If I haven’t sent you the workbook with information on amanita collecting and on taking notes on fresh material, then email me via MO. I will send back a workbook in the form of a PDF. I can’t remember to whom I’ve sent them. Please excuse me if I’ve already sent one.

Very best,

Rod

In trying to bring the WAO site into a more useful…
By: R. E. Tulloss (ret)
2013-07-26 15:33:05 EDT (-0400)

condition vis-a-vis this species, I reread the protologs of A. media Dav. T. Jenkins and A. neglecta Murrill non Boedijn (aka “A. neoglecta” nom. prov.). It seems the latter has a persistent skirt-like ring, pyramidal warts in the center of the cap and a white, unchanging fruit-body.

On the other hand, A. media seems a bit too much like A. radiata. They were both collected in the same spot by Dr. Jenkins and his family. The morphological similarity (as far as the protologs go) seems to be considerable.

More work has to be done.

Very best,

Rod

Previously, this mushroom was only known from the original description.
By: R. E. Tulloss (ret)
2013-07-25 17:28:26 EDT (-0400)

The previously known collections were all from Alabama. Makes sense that it would be in Florida, too.

You rarely see a species of section Validae that has a striate margin even when quite young.

If you find more of this, see if you can see very small bits of volva in a (rough) ring around the top of the bulb (exact position not precisely described). It would be very good to have a good photograph of this character. Stages of development and disappearance of the partial veil would also be good shots.

The brown staining on the cap was not mentioned in the original description. It would be nice to know more about the transition from the button to the stained mature material. Material mature enough to leave a good spore print would also be useful. The material received has spores only on the inner half of the gills and a small number of giant spores. Both are indications that sporulation had pretty much just started in the specimen.

Very best,

Rod

Additional material
By: Justin (Tmethyl)
2013-07-25 17:08:09 EDT (-0400)

I’m quite sure I have more of these dried and stored.
If so they’ll be onboard the next package I send you.

Once again extraordinary work, it is exciting to hear all the news on this one and getting a species ID just tops it off.

Thanks again, I have several new collections to post, I hope to get time for that tonight.

Jenkins based his description on a single collection,,,
By: R. E. Tulloss (ret)
2013-07-25 16:57:27 EDT (-0400)

that was significantly damaged before it was photographed. So these are very useful photographs. The staining visible in these photographs (cap and stem) was not described in the original description. So it appears that Justin’s collection can be very helpful in learning more about the species.

Justin, did you retain any other material in addition to the specimen you sent to us in Roosevelt?

Very best,

Rod

I think we got this one. EDITED
By: R. E. Tulloss (ret)
2013-07-25 16:41:40 EDT (-0400)

Amanita radiata Dav. T. Jenkins.

I have never seen it before except for the illustration in the original description.

http://www.amanitaceae.org?Amanita+radiata

It’s one of three North American taxa with elongate to cylindric spores in sect. Validae; also the striate margin, radial brown fibrils on the cap (not seen in all photos), and disappearing white skirt on the stem are some of the key characteristics mentioned by Jenkins.

Congratulations.

This is a cool one. Now you’ve made have to fill in the gaps on the radiata page on WAO. :)

Rod

Another interesting mushroom.
By: R. E. Tulloss (ret)
2013-07-24 22:43:16 EDT (-0400)

Again, I don’t recognize the species.

Very best,

R.

Thanks Justin,
By: groundhog
2013-07-24 14:09:02 EDT (-0400)

This specimen has been received and accessioned into Rod’s herbarium.
-Naomi

Thank you.
By: R. E. Tulloss (ret)
2013-06-20 18:35:32 EDT (-0400)

I appreciate your generosity.

Very best,

Rod

RET
By: Justin (Tmethyl)
2013-06-20 17:35:29 EDT (-0400)

I do have specimens of this collection and I found more today (as well as some other interesting finds which I’ll add tonight).

Please excuse my lack of using the herbarium ID feature, I do not list them here because I lable my specimens with the observation number. So when I look at a specimen I simply type in the mushroomobserver observation number into the URL.

Just assume I have a specimen for everything I post.
And they are all coming your way Dr.Tulloss

Eric’s comment about the staining reminds me…
By: R. E. Tulloss (ret)
2013-06-20 14:43:58 EDT (-0400)

that if you find this again, we have an excuse to tuck it into a set of samples sent off for sequencing in the “rubescent amanitas” investigation.

R

I think spores will be important on this one.
By: R. E. Tulloss (ret)
2013-06-20 14:41:47 EDT (-0400)

I’d check the species in sect. Lepidella (named by Dav. T. Jenkins) that Jenkins characterized as very near the Validae.

The white part of the caps reminds me a bit of Amanita maryaliceae, but the stipe base is not what I would expect in that species.

If we only knew more of what was meant by spissa var. alba sensu Coker, maybe that would be helpful.

Finally, the pigment in the center of the cap suggests canescens to me.

I’m not really happy with any of the above.

To bad about not having a dried specimen. It’s the way things go.

It’s seriously good to know that the spores are white. I get an awful lot of collections that lack that information. Somebody has to make the observation of a spore print and say what they saw. Only the observations on fresh spore prints are reliable. Amanita spores tend to turn cream-colored with time whether they were original pure white or not.

Very best,

Rod

These were nearly under a large Laurel Oak
By: Justin (Tmethyl)
2013-06-19 23:38:30 EDT (-0400)

I’ll add a pic

Spores are white if that helps
By: Justin (Tmethyl)
2013-06-19 22:36:02 EDT (-0400)

LOL

Created: 2013-06-19 20:50:46 EDT (-0400)
Last modified: 2013-07-25 16:54:17 EDT (-0400)
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