Observation 34102: Amanita Pers.
When: 2007-07-08
No herbarium specimen

Notes: A locally common suburban Amanita preferring grassy areas – large clearings and lawns, always in the vicinity of birch (Betula pendula). It has a broadly umbonate pale beige cap without veil remnants, its stalk is white, rather shaggy and often curved, i.e. visibly different from these:


It usually fruits from late June to early August.

Sorry for bad photos, will try harder in 2010 :(

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They are rather pale, in fact
By: Tatiana Bulyonkova (ressaure)
2010-02-26 02:23:38 CST (-0500)

I’d describe the color as pale tan or cream, yellowish-buff, something like that. And the stem is just off-white, and not concolorous. Sunburn is an unlikely reason – only the one from 79412/79413 grew in a very sunny lawn – and it seems a bit browner than other specimens, and not paler; others were well-shaded. They seem to get paler with age rather than from direct sunlight(adding yet another image to illustrate that)

The taller ones from my other observation were darker, had more pink hues and that superficial layer on their stems was colored, too.
Here’s my attempt at visualizing the difference:

The button seems very pale…
By: R. E. Tulloss (ret)
2010-02-26 01:24:07 CST (-0500)

Is the tan a result of sunburning or is it the original color?

I think flavescens is possible.

In my email the other day I should have mentioned Amanita islandica as a northern species associated with (at least) birch). It is white at first and tends to get sordid over the center of the cap. The upper part of the stem has a very thick layer that is not a true partial veil. Amanita arctica which is mostly known from subarctic heaths has the same characteristic thick “sleeve” on the upper stipe.

These specimens seem to have had a bit of sun (whether it browned them or made them paler I don’t know).


also, check out this long-stemmed example of the sp. here:
By: Debbie Viess (amanitarita)
2010-02-25 13:14:09 CST (-0500)


but as Irene points out, for a definitive ID, do collect more and go deeper. I for one would love to see your results.

Stem length
By: Tatiana Bulyonkova (ressaure)
2010-02-25 13:04:20 CST (-0500)

…is in fact the least of worries, the stem of specimen on the third picture is probably the longest I’ve seen :) It’s usually rather stout and curved for an Amanita of this section, I’d say the specimens on the first picture are typical. This species often grows together with what seems to be A. vaginata var. alba and the difference in stature is striking – the white ones are very straight, neat and slender in comparison.

One thing
By: Irene Andersson (irenea)
2010-02-25 12:56:32 CST (-0500)

that may speak against flavescens, is the relatively long stem. I’m afraid that an ID has to rely on microscopic characters

I had never heard of flavescens either…
By: Debbie Viess (amanitarita)
2010-02-25 12:40:34 CST (-0500)

but Rod’s page on this species also mentions lawn habitat and birch association. Could be a match! Details here:


Thank you, Irene!
By: Tatiana Bulyonkova (ressaure)
2010-02-25 11:06:34 CST (-0500)

haven’t heard of Amanita flavescens before. As far as I’ve understood A. flavescens is a brand new species that used to be recorded as A. crocea in older collections.

Indeed, A. crocea seems to be the closest match to these in what’s listed for our region in a 2001 monograph on Western Siberian fleshy fungi. However, these Amanitas definitely look different from A. crocea (the broad umbo which seems to be a specific feature of this fungus is especially confusing, not to mention general color and stature differences).
I hope to be able to check the A. flavescens version in summer when/if I get my hands on a fresh specimen.

My guess
By: Irene Andersson (irenea)
2010-02-25 10:19:11 CST (-0500)

is Amanita flavescens (or possibly a pale form of A. crocea).

Created: 2010-02-25 07:04:44 CST (-0500)
Last modified: 2010-02-25 07:04:44 CST (-0500)
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