Observation 112671: Amanita sect. Phalloideae (Fr.) Singer

Proposed Names

32% (2)
Recognized by sight: There is a volva at the base.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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The problem at the moment is that we have been operating…
By: R. E. Tulloss (ret)
2012-10-07 23:17:47 CDT (-0500)

under the belief/hypothesis that if it’s pure white and it turns yellow with KOH and it has globose spores and sometimes has 2-spored basidia…then it’s bisporigera.

The species called sp-O01 on the WAO site has been held to be distinct from bisporigera by Walt Sturgeon since before 1980. Recently there has been molecular evidence indicating Walt has been right about the difference for 22+ years. At least in Walt’s collections, sp-O01 is shorter and more thick-set than A. bisporigera and tends to turn gray over the center of the cap as it matures. The biggest problem is that we don’t know if the mushroom is always short and squat or how soon and how frequently we can expect the cap to turn gray.

WAO now has a few pictures of sp-O01, the information that Walt put into his notes in letters to me (remember letters?) and on MO, and some microscopic observations.

That’s two possibilities. We’ve found some material that appears to be bisporigera this year that doesn’t turn yellow in KOH. That could be a third taxon. And there may be a fourth about which we don’t know very much at all.

Right at the moment, we have to face the fact (in the last few months) that we no longer have a sure thing when we find a white destroying angel with a globose bulb and a limbate volva that does not stand up vertically around around the stipe base but collapses against it rather soon after the stipe has fully expanded.


By: Sam.Schaperow (SamSchaperow)
2012-10-07 21:48:19 CDT (-0500)

Excellent specimen. I like the angle the pic was taken of the angel. The fringe along the bottom of the annulus is clearly visible in this picture. I see how this fringe resembles the margin of the pileus showing flocculence. In other words, they resemble each other in a fringed look.

What else could it be?
By: Emma Harrower (eharrower)
2012-10-07 20:06:40 CDT (-0500)

If I had brought this home with me, how could I tell what it was?

This would be unhesitatingly called A. bisporigera earlier this year.
By: R. E. Tulloss (ret)
2012-10-07 19:39:55 CDT (-0500)


Created: 2012-10-07 17:22:54 CDT (-0500)
Last modified: 2012-10-07 19:40:49 CDT (-0500)
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