Observation 110861: Amanita sect. Phalloideae (Fr.) Singer

When: 2012-09-22

Collection location: Moon Lake Park, Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

Specimen available

On a lawn with mixed hardwoods. Pale brassy cap color. At first glance, these mushrooms look a lot like Agaricus arvensis, especially when the caps are not expanded.

This smaller specimen was the only one I could find that showed a well-developed ring on the stipe. With all the other of this type, the partial veil clung to the gills.



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Thank you, David.
By: R. E. Tulloss (ret)
2013-04-25 11:59:19 MDT (-0600)

Material received, accessioned, and heading for the sampling queue. We probably have Moon Lake covered as far as the white destroying angels go. 2013 is the year for citrinoid taxa. The good thing about the citirinoid taxa is that a second paper on the hybrid “lavendula” is (hopefully) nearing the end of the refereeing process; and, so, some results will be continuing to appear in print from Dr. Karen Hughes’ lab at the U. of Tenn., Knoxville.


Here’s another observation reagrding the KOH
By: Dave W (Dave W)
2012-09-23 10:54:11 MDT (-0600)

Stained areas faded overnight, back to more-or-less original color, with the exception that darker areas on the cap were a little darker still.

Your characterization of the color of the cap center as “gray” agrees with my eyes. I have been calling the cap color of these “pale brassy.” There are subtle hints of olive. They have a somewhat metalic luster.

Rod, would you like for me to overnight some fresh material? This upcoming week offers an opportunity for this, as the mushrooms are currently popping.

Thanks for the link to the note form. I’ll load/copy now.

A conveniently condensed form (two sides of one sheet of paper) can be found…
By: R. E. Tulloss (ret)
2012-09-23 06:38:05 MDT (-0600)



This is what I use. It is imperfect. It should have little updates here and there, but it has served for decades of work. This is the same form content that is discussed in the workshop booklet.

I think it would be great if we could move forward with regard to MO…pictures, comments, chemical test, philosophy, etc. can be expanded by adding better and better quality in terms of annotations of fresh material. When we find ourselves facing the effort to find macroscopic and microscopic characters to species first found by molecular means, it is time to pull out the big guns (hard work on annotation of fresh material being one such).

As always,


The observation on the spot test color differences may be very useful. [edit]
By: R. E. Tulloss (ret)
2012-09-23 06:28:22 MDT (-0600)

Hang on to that for your notes.

My note form is in the “in the lab” section of the workbook that Cristina and I have been using for workshops.

I’ll send you a copy. The field notes forms begin on page 28.


Where do I find the “note form?”
By: Dave W (Dave W)
2012-09-22 23:18:51 MDT (-0600)

I can cetainly write up quite a few details for these. Moon Lake Park is a 7 minute drive from my house. There appears to be a large fruiting of this type currently taking place. Interestingly, the patches are found under a variety of different tree types. The one patch appeared to be associated with beech… although about 50 feet away and across a paved roadway there were some oak and pine trees.

I’ve been getting a KOH reaction on the cap with all of these… not a real bright yellow, a little bit dingy, and orangish on the dark parts of the caps.

Waiting for a spore drop for a couple of these.

It just struck me…
By: R. E. Tulloss (ret)
2012-09-22 21:48:54 MDT (-0600)

that I should suggest that you use my note form to write these guys up as if they were a new species…since they might very well be just that.

Very best,


Created: 2012-09-22 21:37:52 MDT (-0600)
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