Observation 111271: Amanita Pers. sect. Amanita
When: 2012-09-26
Herbarium specimen reported

Notes: I took Dr. Tulloss’s field notes for Amanita’s form (Collecting Notes for Species of Amanita) to the field in search of a specimen to record. I found this one.

Single specimen, “Dirty White” in color, tall slender stripe with thin annulus visible in the photo’s.
Radial lines (Striation’s) are gray in color and very pronounced.
White patches of volva are snugly attached to the Pileus.
Remaining cup/volva is hard and brittle, but still firmly attached to the stripe.

Found in grassy area beneath the drip line of a huge old White Oak tree in clay soil.

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Just wanted to mention that we’ve posted examples of the field note form…
By: R. E. Tulloss (ret)
2012-10-18 16:59:17 CDT (-0400)

filled out for sample collections of all seven sections. The form and the samples are accessible from the “teaching topics” box on the upper left of all taxon pages on the WAO site.


It’s important to treat the bulb and the volva as different things.
By: R. E. Tulloss (ret)
2012-09-26 20:36:12 CDT (-0400)

The bulb is a largely unaltered chunk of tissue remaining from the button stage. When the button’s whole stem elongates during development (sect. Vaginatae, sect. Caesareae, sect. Amidella, and a few other smaller groups in Amanita) then you find no bulb at the base of the stem…although you will find a volva (sometimes a pretty big one…e.g., A. jacksonii). When you have a bulb at the base, there may be a distinct layer around the bulb or the volva may be most obviously concentrated at or near the top of the bulb. The latter situation seems to be the case in this observation.


By: John McDonough
2012-09-26 17:15:09 CDT (-0400)

highly probable now that you mention it. It is firmly attached to the stripe unlike the remains of the others I have found lately.


Thanks for the advertising, John. :)
By: R. E. Tulloss (ret)
2012-09-26 16:56:30 CDT (-0400)

I think that there may be a bulb at the base of the stipe in this specimen. If I’m seeing this correctly, then the species would be assignable to sect. Amanita.

Amanita pachysperma is usually smaller with a rather small volval sac on a bulbless stipe base. It is also usually darker in the center of the cap than at the edge.

I’m glad the sample forms were helpful. I should try to get sample forms on line for all six sections of the genus.


Created: 2012-09-26 15:14:13 CDT (-0400)
Last modified: 2012-09-26 17:09:29 CDT (-0400)
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