At first I didn’t recognize this as rhacopus (group). Very dark shiny cap color apparently fades as this type mushroom matures. Gray crumbly UV deposits on stipe base.

Occurrence in area near a stream with mainly ash, tulip poplar, and other hardwoods in an otherwise hemlock-dominated area.

Specimen preserved.


Proposed Names

87% (1)
Recognized by sight: Dark cap with striate margin, ringless, gray UV leaving ring of material on upper par of stipe base.

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= Observer’s choice
= Current consensus


Add Comment
DNA sequence of the “proposed fungal barcode” gene from Linas Kudzma…
By: R. E. Tulloss (ret)
2015-11-27 11:04:05 EST (-0500)

confirms that this is A. rhacopus.

Thanks for the material, David.

Very best,


Thanks Dave,
By: groundhog
2014-09-16 12:33:16 EDT (-0400)

We have recieved this material and accessioned it to Rod’s Herbarium. We have scheduled it for DNA sequencing.

I agree with the placement.
By: R. E. Tulloss (ret)
2014-06-30 23:27:23 EDT (-0400)


It’s been a few years since I’ve seen…
By: Dave W (Dave W)
2014-06-30 23:20:58 EDT (-0400)

an example that looks like this… very dark unopened cap, volva mostly buried. I used to puzzle over this type, which I had occasionally found in the same general location. The gray UV material surrounding the stipe base about 2 cm from the very bottom really seems to point to the rhacopus group.

This one has been preserved and will be included in a subsequent package.

Very interesting, David.
By: R. E. Tulloss (ret)
2014-06-30 20:39:51 EDT (-0400)

I wonder if the stipe’s retaining what looks like the upper part of the volval limb is something constant for this entity. At any rate, I’d like to know how this would be classified molecularly. So if you get a chance to dry one that looks must like this one, I’d be interested in part of the collection.

Very best,


Created: 2014-06-30 20:16:15 EDT (-0400)
Last modified: 2017-12-28 23:31:25 EST (-0500)
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