Observation 228892: Agaricus placomyces Peck

When: 2015-07-18

Collection location: Churchville Park, Bucks Co., Pennsylvania, USA [Click for map]

Who: Luke Smithson (Mycofreak )

No specimen available

Cap: 6.5cm – 9.8 cm wide
White base covered in brown scales, darker in center
Stipe: 6 cm long single, fragile membranous ring
Gills: pink>chocolate, close, free
Flesh discolors very slightly and slowly to brownish red


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Champignons du Quebec…
By: Dave W (Dave W)
2016-01-25 12:32:06 MST (-0700)

seems to emphasize the yellow staining on the cut basal context. The account here mentions yellow or “red wine” stain at the stipe base, presumably uncut. So sectioning the mushroom may be necessary for seeing the yellow.

BTW, I do not understand French. I use an online translation page to get a (very roughly translated) English version of CdQ descriptions.

My original handwritten notes distinctly note no yellowing at all
By: Luke Smithson (Mycofreak )
2016-01-25 10:53:29 MST (-0700)

But I found this later note that I made about it:

“When I rub the base of stipe really hard, it does turn a mustard like brown that does have some yellowish tint to it.” It sounds like I was reaching to see some yellowing, but I guess I saw something. Is the yellowing confined to the context only, or will you see it on the surface of stipe?

I did not record any odor.

Placomyces should stain yellow inside the stipe base.
By: Dave W (Dave W)
2016-01-24 16:15:10 MST (-0700)

But I’m not sure how invariable is this placomyces trait.

Odor is another good piece of info for Agaricus types. Placomyces is one of the phenol-odored species, although the odor may be weak.

Created: 2016-01-24 14:21:25 MST (-0700)
Last modified: 2016-01-24 14:21:29 MST (-0700)
Viewed: 23 times, last viewed: 2020-09-09 06:58:03 MDT (-0600)
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