Observation 137692: Amanita sect. Vaginatae sensu Zhu L. Yang
When: 2013-06-26
No herbarium specimen

Notes: Something from sect. Vaginatae like Amanita fulva? Directly under Sorbus aucuparia, somewhat farther from Tilia cordata, a few meters from the probable host, Betula pendula.

Proposed Names

28% (1)
Eye3
Recognized by sight
60% (2)
Eyes3
Recognized by sight: one of the grisettes. too decayed for good ID.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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The cap color and the short marginal striations… [EDIT]
By: R. E. Tulloss (ret)
2013-06-29 09:55:24 CDT (-0500)

are consistent with A. crocea or something close to it such as A. flavescens. The damage to the stipe prevents us from seeing whether colored fibrils developed on the stipe in a zebroid or “snakeskin” or “flame” pattern. So this one probably would be hard to determine without spores; and I don’t think they would have developed at the stage depicted in your last photos.

So I would start with

http://www.amanitaceae.org?Amanita+crocea and

http://www.amantiaceae.org?stirps+Crocea

and follow the links to check out related taxa.

Amanita flavescens was described from Sweden and is known from Norway…in the latter case it was associated with Betula.

The species are separated by macroscopic characters, the microscopic anatomy [EDIT] of layers of pileipellis that are found on the interior surface of the volval sack, and spore size and shape. Decayed material or juvenile material will probably not be able to be keyed out.

Very best,

Rod

Maggots…
By: Dmitriy Bochkov (convallaria)
2013-06-29 00:52:12 CDT (-0500)

have got to it before it was able to expand, the stipe became full of them. All I was able to do was to get a picture of the unexpanded yet cap’s edge.

I think that it will do better outside of the fridge.
By: R. E. Tulloss (ret)
2013-06-26 16:42:08 CDT (-0500)

I find that it is valuable to stand an Amanita erect in a small cup and wrap its based with damp paper towels or other absorptive paper. When the cup and mushroom combination is set up, I put waxed paper or some other pliable material over the cap to reduce drying of the cap that would defeat the cap expansion plans and limit spore development.

Very best,

Rod

Thank you for your comments, Dr. Tulloss
By: Dmitriy Bochkov (convallaria)
2013-06-26 16:29:28 CDT (-0500)

The cap under the veil is indeed orange-tan. I will try to expand this specimen a bit in the fridge to see what it would look like.

Looking at it now I think I came up with the section simply because of its members being a lot more common and diverse here than of other sections.

Also, I don’t see any indication that the cap margin is striate (in what part is visible)…
By: R. E. Tulloss (ret)
2013-06-26 15:36:43 CDT (-0500)

This also suggests that we are not looking at something in sect. Vaginatae.

Rod

A pointed base on the stem would be a little unusual in sect. Vaginatae.
By: R. E. Tulloss (ret)
2013-06-26 15:34:32 CDT (-0500)

I think there is a narrow bulbous base on the material (first photo).

I can see an moderately orangish tan or moderate orange cap color exposed in the first photo. The coherence of the volval patch on the cap might suggest that the species in question would sometimes have a limbate volva on the upper bulb or base of stem.

R

Created: 2013-06-26 11:13:52 CDT (-0500)
Last modified: 2013-06-29 10:38:13 CDT (-0500)
Viewed: 52 times, last viewed: 2017-02-04 04:21:21 CST (-0600)
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