Observation 210526: Amanita sect. Amanita

When: 2015-07-17

Collection location: Castle Rock State Park, Ogle Co., Oregon, Illinois, USA [Click for map]

Who: T. Nelson

No specimen available

Growing on the ground in a primarily deciduous woodland. Very large and very heavy.

Proposed Names

56% (1)
Recognized by sight: Based on the volval patches on the pileus, the bulbous base with remnants of volva on it (2nd photo), and white gills.
56% (1)
Recognized by sight: Short gills are truncate and stipe base with a large bulb.
18% (2)
Used references: Arora, Mushrooms Demystified. Bulbous base, collar-like volva, annulus present.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Amanita Studies website…
By: Dave W (Dave W)
2015-07-19 06:12:12 PDT (-0700)

mentions that muscaria var. guessowii sometimes has a stipe that “flares at the top.” With this specimen the flaring is apparently exaggerated because the mushroom is old and blown-out. So maybe this is an old faded muscaria var. guessowii. Marginal cap striations seem long for this species, though. But once again… difficult to judge an old specimen like this.

By: Daniel B. Wheeler (Tuberale)
2015-07-19 05:51:42 PDT (-0700)

present in 3rd photo, appressed to stipe (near left-hand thumb nail).

Was hopeful someone would mention the stipe-pileus attachment which is rather striking.

I don’t see an annulus.
By: Dave W (Dave W)
2015-07-18 15:26:01 PDT (-0700)

Or else I may have at least mentioned muscaria or velatipes.

Like ret says, characters are too old to get a good read on species.

This species is many times to big for flavoconia.
By: R. E. Tulloss (ret)
2015-07-18 15:23:01 PDT (-0700)

The yellow might be due to decay and not be the color of the volva. The specimen is very old.


I think so, T.
By: Daniel B. Wheeler (Tuberale)
2015-07-18 14:42:37 PDT (-0700)

Something near Amanita aspera. But not A. aspera I think, which should have a yellow partial veil. I don’t see any veil here. (The third photo shows a dried veil on the stipe.) The stature is quite large (or at least looks that way to me). Another interesting feature is the stipe near the cap: it enlarges just before joining the cap. I don’t think that is a feature of A. aspera.

I hope ret. will be able to comment on this robust Amanita.

By: T. Nelson
2015-07-18 11:33:06 PDT (-0700)

Is there any possibility of a species designation?

Created: 2015-07-18 09:42:32 PDT (-0700)
Last modified: 2015-07-18 15:21:14 PDT (-0700)
Viewed: 66 times, last viewed: 2017-06-20 08:24:26 PDT (-0700)
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