Observation 112858: Amanita abrupta Peck

When: 2012-10-07

Collection location: Splashdam Pond, Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

Specimen available

Under Red Spruce.

Spore drop not thick enough to test for amyloidity.

Proposed Names

20% (3)
Recognized by sight
Used references: discussion contained within comments
3% (2)
Recognized by sight: appendiculate margin, multi-layer volva at base.
27% (1)
Based on microscopic features: See comments.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Hello David,
By: R. E. Tulloss (ret)
2013-05-07 15:11:25 CDT (-0400)

We took a look under the scope.

This could very well be an immature specimen of Amanita abrupta. If it is, the normal size spores are a good match, and there are some very large spores that may come from 1-spored basidia (not too unusual for specimens just starting sporulation in Amanita).

Unfortunately, we have a temporary problem with gets nrITS sequences run; and so I can’t report on the DNA…yet.

Very best,


Well let’s see if getting an ITS sequence from this critter will support our hypothesis…
By: R. E. Tulloss (ret)
2012-10-10 14:58:15 CDT (-0400)

that there are specimen of A. abrupta that aren’t abrupt….


Yes, the spores are broadly ellipsoid.
By: Dave W (Dave W)
2012-10-10 13:40:24 CDT (-0400)

I have encountered many examples of what seemed to me to be A. abrupta… but without the abrupt bulb. Just checked the Amanita site, and the description of the spores for abrupta appears to fit this collection. A. abrupta is common around here during October.

The spores seem a little small for most lepidellas and broadly ellipsoid…
By: R. E. Tulloss (ret)
2012-10-10 12:31:46 CDT (-0400)

in the picture. Am I getting that right?

I saw the scattered pyramidal warts also, Dave.

I have seen one specimen of Amanita abrupta this year that had a bulb that was not very abrupt. This bulb is even less abrupt than the one I just mentioned. But maybe abrupta should be considered.

Very best,


Deb, maybe I’m just forgetting something…
By: Dave W (Dave W)
2012-10-10 12:19:51 CDT (-0400)

but I do not recall any local (PA) species of sect. Amidella having the prominent skirtlike annulus.

The pyramidical warts…
By: Dave W (Dave W)
2012-10-10 11:49:59 CDT (-0400)

scattered along the outer portion of the cap also bring to mind Lepidella. I thought the basal structure was a bit puny for Lepidella. Perhaps the striations are a weather-related aberration?

Rod, I’m hoping to put together a package of material for you within the next few days. (The problem is that I keep finding new stuff that seems interesting!) I can include this one along with the Phalloideae and Vaginatae material that I’ll put together. Or I can wait and include this one in another package later. Or, I can just send everything from this year in one big mailing. What is your preference?

The fibers under the partial veil…
By: R. E. Tulloss (ret)
2012-10-09 20:30:29 CDT (-0400)

make me think of sect. Lepidella. The striate margin is a real puzzle.



Created: 2012-10-08 21:03:39 CDT (-0400)
Last modified: 2018-01-02 15:57:56 CST (-0500)
Viewed: 86 times, last viewed: 2018-01-02 16:31:00 CST (-0500)
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