Observation 34099: Amanita flavescens (E.-J. Gilbert & S. Lund.) Contu
When: 2009-08-13
No herbarium specimen

Notes: Growing under Betula pendula near an abandoned Picea obovata nursery. The cap is a tender beige, and stem surface is concolorous and only slightly shaggy.

Note: these specimens are tentatively different from another, more common local light-beige Amanita (http://mushroomobserver.org/34102?search_seq=1331246) which has a shaggier white stalk, is often asymmetric and less slender, and often appears in suburban habitats i.e. on lawns under birch.

Proposed Names

33% (2)
Recognized by sight
54% (1)
Recognized by sight
Used references: Amanita Studies A. flavescens page.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Thanks, Douglas….
By: R. E. Tulloss (ret)
2010-02-26 03:40:07 PST (-0800)

Thanks for the “fix” and the explanation.


A. flavescens “fixed”
By: Douglas Smith (douglas)
2010-02-25 23:58:24 PST (-0800)

To fix the name, you just had to click on the “Approve” link at the top, in the line with the “Edit name” links.

Thanks, Rod!
By: Tatiana Bulyonkova (ressaure)
2010-02-25 23:46:06 PST (-0800)

You’re right, no orange or brown tones there at all – that’s what made me doubt that it’s the standard A. crocea in the beginning – the palette is within pale yellow and pale pink limits. The picture was taken after lunch but it was overcast, so the colors are a bit pale yet there aren’t really any “parasitic” red hues – these were actually pinker and darker than those in #34102.

I’d really appreciate any specific hints on microscoping my way to their ID (currently studying basic Amanita microscopy guidelines at The Site ;))

I tried to propose the name A. flavescens, but there is a problem….
By: R. E. Tulloss (ret)
2010-02-25 22:13:31 PST (-0800)

For some reason the correct spelling and correct author citation for Amanita flavescens is treated by the MO system as a deprecated name. A name with plentiful typos in the author citation is said to be the correct name. This needs to be fixed.

A. flavescens seems close…
By: R. E. Tulloss (ret)
2010-02-25 21:59:21 PST (-0800)

Well, Auto Contrast was a simple thing to try. It both brightened the picture and removed some red. (Was the picture taken early or late in the day?) The result is that I can see that the standing specimen has a pale stipe with neither orange brown decoration nor an orangish background to the white surface material. The cap lost some of it red (less orange). As a result, the material looks very much like the A. flavescens that I saw fresh in Norway. The inside of the volval sac is concolorous with the cap, and that suggests to me that some of the pileipellis remains attached to the inner surface of the volva (this is characteristic of taxa in the A. crocea group, including A. flavescens). If you get a chance to check similar material with a scope in the coming year, I can give you some clues about distinguishing the known taxa in the crocea group.

Very best,


Amanita crocea group is possible…
By: R. E. Tulloss (ret)
2010-02-25 21:47:58 PST (-0800)


I think this is close to Amanita crocea or Amanita flavescens. I’m going to see if I can brighten the image a little with photoshop…to see if I can get any clues. How does the cap color compare to rather freshly fallen birch leaves? In Norway, some of the newly fallen birch leaves were very close to the cap color of A. flavescens.


Created: 2010-02-25 03:20:19 PST (-0800)
Last modified: 2010-02-25 03:20:19 PST (-0800)
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