Observation 133777: Amanita rubescens group
When: 2013-05-15
No herbarium specimen

Notes: Found directly under oak, in very dry conditions, 8 days after last rain.
Much red bruising.

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The white on the cap.
By: R. E. Tulloss (ret)
2013-05-15 20:15:37 PDT (-0700)

In the photographs, the white swathe across the cap could be the original color of the cap before staining. But it seems to me that i might be a powdery white mold that is growing on an old fruiting body that has seen better days. From you describe, the critter had a rough life. Your phrase “the scaling” suggests to me that you see the white area as something superimposed on the cap or coming off the cap. Maybe like dandruff.

I’m looking at your pictures, but you took them. So it’s important for me to adjust what I see according to you telling me about your experience of seeing the fresh material and photographing it.

If a fungus of some kind is attacking the rubescent specimen, then the spores of the Amanita may be abnormal and the chemical process of selecting and sequencing an Amanita gene might pick up the gene from a basidiomycete (not an agaric) that happens to be living on, or living off of, the Amanita.

So we might have problems that would confuse the picture morphologically or we might have a little (or a lot) of difficulty getting Amanita genetic material from the specimen.

This is my motivation for asking what the white area on the cap looked like to you.

I’m interested in knowing what you saw on the fresh specimen.

Very best,


By: Justin (Tmethyl)
2013-05-15 18:43:48 PDT (-0700)

White on caps? You mean the scaling?
Or did you mean weight? If so the weight is:
(wet = 25grams)
(dry = 2.5grams)

In pic 121 there is some sand on cap.

Hello, Justin.
By: R. E. Tulloss (ret)
2013-05-15 18:28:04 PDT (-0700)

I think I have to look the gift horse in the mouth and ask what you think the white on the cap is. What’s your best guess?

Very best,


Created: 2013-05-15 16:54:42 PDT (-0700)
Last modified: 2013-05-15 16:54:44 PDT (-0700)
Viewed: 24 times, last viewed: 2016-10-23 08:51:52 PDT (-0700)
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