Observation 110712: Amanita sect. Phalloideae (Fr.) Singer
When: 2012-09-21
Who: jimmiev
No herbarium specimen

Notes: I think this is near Amanita elliptosperma

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By: R. E. Tulloss (ret)
2012-09-22 09:49:22 PDT (-0700)

Very kind of you.


Is that solution w/w or w/v? I keep forgetting.
By: Stephen (Ιερονυμοσ)
2012-09-22 08:41:55 PDT (-0700)

You can also often get KOH from some co-ops and farmer’s supplies as potash.

You can purchase KOH online.
By: Britney Ramsey (Riverdweller)
2012-09-22 08:34:05 PDT (-0700)

And cheaply too. I have purchased twice from this company with no issues.

I would also be happy to send you some if online ordering isn’t possible. Email via this site if you need some.

We need to get you some KOH some how. [edited twice]
By: R. E. Tulloss (ret)
2012-09-21 20:31:45 PDT (-0700)

You’re welcome.

KOH: Maybe from a Chem. Dept. at nearby college or university? You only need 5% solution to get a yellow reaction (although closer to 10% makes it more dramatic).

I just checked to see if we had Coker’s picture of gwyniana on-line on www.amanitaceae.org, and we don’t. I will scan the original publication tomorrow and try to get the image on-line before the weekend is out. [Bug me if it’s not there on Monday.]

The glass plates (I think) of Coker’s photographs are at Chapel Hill. It would be an interesting project to raise the funds to get them on-line and linked to the original publication, which would also have to be placed on-line. Bas said that Coker’s notations on his dried collections were the best Bas saw in any North American herbarium.

Coker was a very good photographer, too.

Very best,


By: jimmiev
2012-09-21 20:10:01 PDT (-0700)

no KOH atm, but I will collect these and the orange sect. Vaginatae tomorrow. is Coker’s photograph of A. gwyniana online?

thanks for the help!

I omitted saying…
By: R. E. Tulloss (ret)
2012-09-21 18:53:17 PDT (-0700)

that a I agreed with you that the collection was close to A. elliptosperma. The broad bulb is reminiscent of Coker’s photograph of his A. gwyniana, another taxon that seems awfully similar to A. elliptosperma.

And I like the photo very much.


Pinkish gills were described for…
By: R. E. Tulloss (ret)
2012-09-21 18:51:15 PDT (-0700)

Amanita hygroscopica, which may be the same as A. elliptosperma. The latter doesn’t turn yellow when KOH is placed on the cap. Do you have the opportunity to check this character?

If you have the opportunity to dry this specimen, it could prove very valuable in sorting through the ellipsoid-spored white taxa in sect. Phalloideae in North America.


Created: 2012-09-21 17:10:41 PDT (-0700)
Last modified: 2012-09-21 17:11:17 PDT (-0700)
Viewed: 116 times, last viewed: 2016-10-24 07:48:37 PDT (-0700)
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