Observation 32202: Amanita muscaria var. guessowii Veselý
When: 2009-06-28
No herbarium specimen

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By: Noah Siegel (Noah)
2010-01-20 07:13:09 GMT (+0000)

what have I become… I’m in CA for a week and end up looking eye to eye with a slug.
I tried to rip off Richard Sullivan’s russula wheel with Hygrocybes yesterday
but I failed miserably…

I’d be glad to look…
By: R. E. Tulloss (ret)
2010-01-20 02:48:20 GMT (+0000)

at a specimen. It’s pretty easy to tell whether it’s frostiana or not. The spores of frostiana are nearly round. Those of amerimuscaria are distinctly ellipsoid. If you take the average length of spores divided by the average width of spores, the number you come up with for frostiana is 1.06 based on my data (where 1.0 would mean “perfectly round”) and the number you’d get for amerimuscaria would be 1.42. Of course, both numbers are based on my sampling and someone else (using my spore measurement approach) would probably get something very close, but not necessarily the same to two decimal places.

Very best,


These mushrooms
By: Eric Smith (esmith)
2010-01-20 02:09:32 GMT (+0000)

look very different (to me) than the A. amerimuscaria I usually find. These ones with the striate caps I’ve found only in one small “patch”.

I have a nice spore print and a dried specimen if you’re interested.

Thanks for the input, guys!

By: R. E. Tulloss (ret)
2010-01-19 17:37:41 GMT (+0000)

What is becoming of us?

I had the same thought, Noah.


the thick
By: Noah Siegel (Noah)
2010-01-19 15:57:09 GMT (+0000)

warts make it look more like amerimuscaria; especially the button…

It could be…
By: R. E. Tulloss (ret)
2010-01-19 04:33:25 GMT (+0000)

The young cap is distinctly striate. That is a good argument against this being A. flavoconia or A. elongata. If there is a contest, it is between a small specimen of var. guessowii (which is now thought to be a color variant of “A. amerimuscaria” as is often discussed on MO) and A. frostiana. The latter is sufficiently rare in my neck of the woods that I hardly ever see it. I think it is more common to the north of New Jersey and in the Appalachian Mtn. chain.

Interesting photos.


Created: 2010-01-19 03:00:24 GMT (+0000)
Last modified: 2011-04-18 02:34:39 BST (+0100)
Viewed: 113 times, last viewed: 2016-10-28 11:57:50 BST (+0100)
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