Observation 171196: Amanita aestivalis Singer ex Singer
When: 2014-07-25
No herbarium specimen

Notes: Cap 8cm wide with reddish-orange tints, yellowish on the disc, and with a faintly striate margin (10/80mm). Annulus superior, white, pendant at first which is striate above and smooth below. Annulus becomes pinkish-orange. Stipe 12cm long to top of what appears to be a cleft bulb, white with some light brown squamuoles, stuffed, brittle. Bulb approx. 2.5cm long x 3.5cm wide with orangish stains. Worm holes in stipe stain reddish orange. Basal rhizoids white. Gills free, narrow, white, but yellow orange in mass (possibly due to aging) or dessication. Gill edges appear smooth. Three lenghts of lamellulae. Taste mild; odor reminescent of raw potatoes. Pileal trama thin ,white unchanging.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Hello Rod
By: Phil (gunchky)
2014-07-28 13:53:02 PDT (-0700)

Thank you very much for your comments, the information you sent to me and most of all thank you for all of your time that you spent on this obs. A day or two in Rossevelt sounds appealing. I’ll keep that in mind. Thanks again. Phil

Hello, Phil.
By: R. E. Tulloss (ret)
2014-07-27 18:00:56 PDT (-0700)

A striate upper surface of the annulus is pretty much standard in Amanita…at least the material for the striations is always present although variable in quantity. The striations are rows of the cells that allow the gills to separate from the annulus. Since amanitas start off as a solid lump of tissue, all the parts of the mushroom that are separate at maturity have to have some relatively graceful way of separating. In the case of the gills, they will have to separate from the stem and/or from a partial veil. This happens by means of the Agaric answer to Velcro.

In the button, easily broken chains of little balloon-like or pear-like cells form on the gill edges. (this is why there are no basidia on the gill edges in Amanita.) This mass of cells breaks up easily and leaves some of the material on the gill edge (which is why Amanita gill edges are so often seen to be decorated with fine flocculence) and some of the material in radiating rows on the upper surface of a skirt-like annulus.

So it’s much more of an important fact if an amanita never has striations on the top of the partial veil…if there is such a case. See the WAO page called


and its dependent pages. Most of the dope about development of fruiting bodies is there. Amanita is the only genus in the agarics which develops all its parts inside a solid mass. It’s as if amanitas started off to be truffle-like but have this last minute trap-door to become a gilled mushroom.

A course in Wilkes-Barre might be a stretch; but a day or two in Roosevelt, NJ, might be feasible.

Very best,


Hi. Rod
By: Phil (gunchky)
2014-07-27 17:03:23 PDT (-0700)

I respect your opinion and thank you for your comment. However I would like to know if A. aestivalis has a striated annulus on the superior portion, and could you tell me if that species has an odor of raw potatoes. These amanitas , as well as other genera are becoming increasingly confusing. How about you moving to Wilkes-Barre and teaching Mycology at King’s College? You would have at least two students (Dave W. and I). Wishful thinking on my part. Phil.

Good morning, Phil.
By: R. E. Tulloss (ret)
2014-07-27 05:33:07 PDT (-0700)

At least as far as the proposed barcode gene goes, aestivalis is probably not going to be distinguishable from brunnescens. Morphologically, they share the form of the fruiting body…especially, the vertically cleft, abrupt bulb. The character is very evident in your good images.

I would give a “promising” vote for aestivalis in this case.

Very best,


Created: 2014-07-25 18:06:00 PDT (-0700)
Last modified: 2015-03-25 18:31:24 PDT (-0700)
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