Observation 142851: Amanita brunnescens var. pallida L. Krieg
When: 2013-08-14
No herbarium specimen

Notes: White to ivory white cap with yellowish coloration on the disc- photo doesn’t show it very well- and ’Cleft-foot" bruising reddish. Under Oak and Hemlock.

Proposed Names

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Used references: Phillips

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Thanks Rod
By: Phil (gunchky)
2013-08-18 17:47:55 PDT (-0700)

On MO 142235 I posted A. bisporigera, and Igsifonov posted A. aestivalis, which I tentavily agreed with mentally. Upon further reading-in an older book- I found A brunnescens var. pallida which I choose to post. I now agree with both of you. Thanks again. Phil

Hello, Phil.
By: R. E. Tulloss (ret)
2013-08-17 13:03:07 PDT (-0700)

If the material in your photos is distinct from A. brunnescens, I think the probable name would be A. aestivalis.

http://www.amanitaceae.org?Amanita+aestivalis

The pale citrine form of brunnescens will grow in a fairy ring with specimens that have deep brown caps:

http://www.amanitaceae.org?Amanita+brunnescens

Almost 4 decades ago, Dr. Rene Pomerleau (of Quebec) noted that he thought there was “no taxonomic value” to “brunnescens var. pallida”; after seeing a fairy ring with pale, dark, and half-and-half caps in it in South Carolina, I gave up on var. pallida. By now we know that there appears to be no difference genetically between the brown and pallid caps. The issue of the relationship to aestivalis is still somewhat open; however, the differences in the sequences from aestivalis and brunnescens is very, very close to the expected error rate of one of the processes that produces sequences. We are studying the matter this summer with the help of Dr. Hughes in Knoxville. Material of a “white brunnescens” (even with a faint yellow over the center of the cap) is welcome and can contribute to the process of understanding whether aestivalis is separate from brunnescens or not… given current molecular methods/practices.

Very best,

Rod

Created: 2013-08-15 18:51:36 PDT (-0700)
Last modified: 2013-08-15 19:51:50 PDT (-0700)
Viewed: 71 times, last viewed: 2016-10-28 11:36:35 PDT (-0700)
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