Observation 24921: Amanita brunnescens G.F. Atk.

When: 2009-09-02

Collection location: Maine, USA [Click for map]

Who: Erlon (Herbert Baker)

Specimen available


Copyright © 2009 Erlon Bailey
Copyright © 2009 Erlon Bailey
Copyright © 2009 Erlon Bailey
Copyright © 2009 Erlon Bailey
Copyright © 2009 Erlon Bailey
Copyright © 2009 Erlon Bailey

Proposed Names

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Erlon (Herbert Baker)
2009-09-03 09:19:18 CDT (-0500)

Staining was very minimal after 24 hours where i damaged the specimen.

To clarify a point
By: R. E. Tulloss (ret)
2009-09-02 21:08:16 CDT (-0500)

For the sake of conservatism, A. aestivalis has not been stated to be a synonym of A. brunnescens. On the other hand, since I’ve found var. brunnescens and var. pallida (nota!) in the same fairy ring, I have not seen any value in separating those two vars. Pomerleau was way ahead and stated (I think in his big “Champignons de Quebec”) that there was “no taxonomic value” in the name var. pallida. From the color of the caps in the present observation (compare with the white of the stipe), I think is is A. brunnescens. Amanita aestivalis has a cap that is truly white except for a tannish or yellowish center. Singer points out that it bruises/stains much more slowly than A. brunnescens. We were able to segregate pallid citrin specimens of brunnescens from specimens of aestivalis using the two characters of Singer on the past weekend at the COMA foray. It was very clear that brown staining took over the pile of brunnescens specimens, but made only a slight impact on the pile of aestivalis specimens over a period of 2-plus days.

Will A. aestivalis be viewed as belonging within the concept of A. brunnescens? Time will tell. Probably DNA studies will give us some idea on this subject. I provided material for such a study a year ago, but I have not heard if the study was actually performed.

A person interested in aestivalis and brunnescens might also be interested in seeing their European cousin, A. asteropus, which has a web page of its own on the Amanita Studies site.

Very best,


Very best,


These are synonyms
By: walt sturgeon (Mycowalt)
2009-09-02 18:32:43 CDT (-0500)

I think Rod has them both under A. brunnescens now.

how do you separate this one from brunnescens alba?
By: Debbie Viess (amanitarita)
2009-09-02 18:27:36 CDT (-0500)

Created: 2009-09-02 17:58:09 CDT (-0500)
Last modified: 2011-06-24 08:36:11 CDT (-0500)
Viewed: 87 times, last viewed: 2017-06-06 02:21:02 CDT (-0500)
Show Log