Observation 107975: Amanita subsect. Vittadiniae Bas
When: 2012-08-30
Herbarium specimen reported

Notes: Found already dried in the field. In sandy-clay soil amongst Acacia, Simmondsia, Larrea, and Parkinsonia. In small groups, abundant. Collected 20+ in 10 minutes.

Proposed Names

60% (2)
Recognized by sight: General aspect, velar remnants on ground next to some specimens.
81% (1)
Based on microscopic features: Used Bas’ characterization of the subsection from his 1969 thesis.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Thank you, Bob, for sending us this material.
By: R. E. Tulloss (ret)
2016-02-05 17:14:48 CST (-0600)

Very best,


The spores are a best match to Amanita prairiicola.
By: R. E. Tulloss (ret)
2016-02-05 17:13:42 CST (-0600)

The appearance of the fruiting body is very similar to that of the previous Arizona collection of this species except for the fact that there is more of a bulb at the stem base.

We will schedule this material to be sampled for sequencing.

Very best,


Hello, Bob.
By: R. E. Tulloss (ret)
2016-02-05 15:35:42 CST (-0600)

Thanks very much for the information. We’re going to treat each of your numbers as a separate collection, and refer both collections to this MO observation number.

This material can be assigned to Amanita subsection Vittadiniae Bas. It is very likely to be amycorrhizal. I notice that there were no trees in the vicinity. We will give a sample (or samples) priority for sequencing. I am seeing what I can do morphologically this afternoon and will report on my results if any.

Very best,


By: Bob Chapman (Disciseda)
2016-02-05 15:19:49 CST (-0600)

1384 and 1390 are separate collections, though found near each other. Some of the images are marked 1384 and 1390 because representative of both collections. 1384 and 1390 are the same taxa and could if you like be called one collection.

Hello Bob,
By: groundhog
2016-02-05 13:24:19 CST (-0600)

I am working on accessioning your recent shipment to Rod’s herbarium and have a question. It looks like your number 1384 and 1390 both are from this observation, is that correct?



Hello, Bob.
By: R. E. Tulloss (ret)
2015-10-27 17:31:41 CDT (-0500)

I received your message that these were on the way.

Very best,


Bob, thanks for reminding me of this collection.
By: R. E. Tulloss (ret)
2012-09-14 23:30:50 CDT (-0500)

It could be an amanita, but the shape of the bulb is a bit unusual for the “free-living” taxa that I know from the western and prairie states of the U.S. We’ll put it in the queue to look at if you send it along.


Amanitas in drylands
By: Erik nelson (eriknelson)
2012-09-04 00:00:55 CDT (-0500)

I recently found gregarious fruitings of a white Amanita in the PJ woodlands in volcanic soil. Dry area but lots of Amanitas…

Created: 2012-09-01 16:08:02 CDT (-0500)
Last modified: 2016-02-05 15:38:01 CST (-0600)
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