Observation 83298: Amanita sect. Amanita

When: 2011-09-03

Collection location: Mazomanie Oak Barrens State Natural Area, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

No specimen available


Proposed Names

5% (2)
Recognized by sight
61% (2)
Recognized by sight

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Add Comment
Neither do I…
By: R. E. Tulloss (ret)
2011-11-28 22:30:57 CST (-0600)


If you’re lurking out there, could you let us know your source?

Very best,


KOH test
By: Andrew Khitsun (Andrew)
2011-11-28 19:55:11 CST (-0600)

Information regarding KOH test is in several places online, but I believe originates from M.Kuo’s Mushroomexpert.com. I don’t know where he got it from.

KOH test?
By: R. E. Tulloss (ret)
2011-11-28 10:27:29 CST (-0600)

Interesting, but I’m not sure how that can be known. Someone would have to have definitive knowledge that a collection represented A. russuloides and then have tested it. I’m not sure how the definitive knowledge could have come about. The only person who has studied the type that I know of is David Jenkins. He seems to have quickly decided it was a synonym of the European gemmata and didn’t make further observations so far as I know. We know that his conception of gemmata was way too broad (including east and west coast taxa in the U.S. that are different from each other as we as from the European species).

Where did you find the KOH test information?


KOH to the resque?
By: Andrew Khitsun (Andrew)
2011-11-27 22:49:46 CST (-0600)

It looks like the cap of A.russuloides turns orangish from KOH. I can get a sample next season and test it. Is it a reliable charachteristic?

probably not in North America
By: R. E. Tulloss (ret)
2011-11-27 21:19:45 CST (-0600)

The eastern North American name that might apply is A. russuloides. One difficulty is knowing exactly what mushroom to which to apply this name. The second difficulty is understanding whether there is one or two or more candidates for the entity to be called “russuloides.” I’m afraid that I haven’t been able to satisfy myself that I have answers to those problems. I don’t mean to say I have given up. I have not. It just isn’t a resolved issue at this point.

Very best,


Amanita gemmata?
By: Andrew Khitsun (Andrew)
2011-11-27 20:09:17 CST (-0600)

I wonder if Amanita gemmata fits the bill here. It’s said to be very variable, but grows on sand just like this one.

No specimen available
By: Andrew Khitsun (Andrew)
2011-11-26 20:52:35 CST (-0600)

My bad – I ment to say there is no visible volva enveloping the bulb. I couldn’t preserve specimen like this one, despite having read about the technique. I can get one next year, if necessary – these mushrooms always grow at one of my favorite spots. I didn’t notice the ring on buttons – just didn’t look hard enough, I guess.

There is a volva…
By: R. E. Tulloss (ret)
2011-11-26 04:51:45 CST (-0600)

in the form of the crumb-like warts on the cap. I think there may be more at the top of the bulb. The strongly striate cap margin, the squarely cut-off short gills (bottom photo), and the presence of a distinct bulb suggest that this species belongs in Amanita sect. Amanita.

Was there a ring on the stem in the button specimens? The species is very interesting and is somewhat suggestive of this one:


Did you retain dried material?

Very best,


No volva
By: Andrew Khitsun (Andrew)
2011-11-25 22:30:42 CST (-0600)

These Amanita grow in sand and form very large groups. They appear to have no volva. The spore print is cream or white.

Created: 2011-11-25 22:16:10 CST (-0600)
Last modified: 2012-06-06 15:28:06 CDT (-0500)
Viewed: 104 times, last viewed: 2020-06-26 04:00:07 CDT (-0500)
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