Observation 109403: Amanita sect. Phalloideae (Fr.) Singer

When: 2012-09-11

Collection location: Dallas, Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

Specimen available

When I orginally spotted these growing on a lawn adjacent to a burial ground they were just beyond the button stage. I attempted to excavate the largest of three, but ended up mangling the basal structure. So I didn’t bother to take any material with me. I had thought they were bisporigera.

But a few things struck me as odd… short stout structure, growth on a lawn, and there seemed to be quite a bit of free-standing basal volval material (limb) mostly buried. I know that bisporigera typically exhibits a vovlal limb. But this material seemed rather membraneous.

Seeing Walt’s post today brought these mushrooms to mind. So I went back to get them. Although none of them was in real good shape, one was mainly intact, except for the basal structure, which I found it impossible to keep from falling apart. But I did manage to dig up some vovlal remnants. In the one photo, they are positioned alongside the base of the mushroom. Note the tannish tint on the caps. To the eye, there was an olivaceus component.

On a grassy lawn within 30 feet each of one large oak and one large spruce.

Yellow on larger cap is KOH reaction.

The better one is drying in the attic. Hoping to get a few spores to drop out of the larger cap.

Micro shots show (I think) pleurocystidia. Last photo is a smash mount, and next to last is (I think) along the edge of an angled cut.

Proposed Names

18% (2)
Recognized by sight: looks like young, somewhat dessicating material. growing in grass sure, but there must’ve been a tree somewhere near!
Based on microscopic features: probably too young for spores; I agree that your micro structures look like basidioles.
Based on chemical features: yellow color w/KOH.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Today’s very hectic here in NJ.
By: R. E. Tulloss (ret)
2012-09-19 15:06:47 CDT (-0500)

I forgot to mention that I’ve begun to post the information that I’ve gotten from Walt’s collections sent to me over the last 22(!!!) years. The guy deserves a medal for persistence.

The info is expanding and can be found here:



Thanks for the suggestion, Rod.
By: Dave W (Dave W)
2012-09-19 14:06:43 CDT (-0500)

I’ve been following the developing story of the species-splitting of the Destroying Angel. Actually, seeing some of the discussion on Walt’s posts motivated me to make this collection. The habitat and the material reminded me of some that I had recently seen in a cemetery, which are the ones seen in this obs.

So there’s new motivation to make collections of these types… perhaps particularly when found in unusual habitat.

I don’t think it relates to this collection, but…
By: R. E. Tulloss (ret)
2012-09-19 13:50:03 CDT (-0500)

Check out the newly renamed observations for Amanita “sp-O01”. It looks like we have two or three or more species hiding under our application of the name bisporigera.


Yes, I’ve preserved the one…
By: Dave W (Dave W)
2012-09-19 10:43:16 CDT (-0500)

that didn’t get the shot of KOH.

Also, with all the rain we just received, maybe another fruiting will occur. I’ll check soon.

By: R. E. Tulloss (ret)
2012-09-19 08:42:27 CDT (-0500)

Would you include this material in the set you are planning to send me, please?


Thanks Rod.
By: Dave W (Dave W)
2012-09-15 10:53:33 CDT (-0500)

Being somewhat of a novice when it comes to analyzing micro-traits, I’m often quite uncertain about the identities of the various stuff I see.

My guess is that you are seeing immature basidia.
By: R. E. Tulloss (ret)
2012-09-12 16:02:43 CDT (-0500)

The last shot has a number of such rather clearly focused at about the middle of the image. To date (hundreds of species) no one has yet correctly described cystidia of any kind from any species in the Family Amanitaceae. I’ve argued that cheilocystidia cannot occur because of the unique development of an Amanita button. I don’t have that kind of an argument for pleurocystidia. But perhaps it is worth thinking about why genus with the unique development process of an Amanita would develop pleurocystidia when they apparently don’t exist the residual species of Limacella (with normal agaric development) that apparently is the closest agaric genus to share a common ancestor with Amanita.


Created: 2012-09-11 19:05:20 CDT (-0500)
Last modified: 2018-01-02 11:45:17 CST (-0600)
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