Observation 78112: Leucoagaricus americanus (Peck) Vellinga

When: 2011-10-05

Collection location: Lake Forest Park, Washington, USA [Click for map]

Who: Tim Sage (NMNR)

No specimen available

Found by Rory Pease.

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Dried red….
By: Tim Sage (NMNR)
2011-10-10 21:50:08 PDT (-0700)

Thanks for all the help!

Chemical test?
By: Tim Sage (NMNR)
2011-10-06 13:50:13 PDT (-0700)

The specimen originally bruised yellow-brown when cut, but never changed to red at all.

Anyone know what either of these species does when KOH is applied? In Matchmaker it says that L. americanus will leech red onto the slide when a preparation is made with KOH.

When I applied KOH to the cap surface and the stipe flesh, it turned green-blue.

Until we find another….
By: Tim Sage (NMNR)
2011-10-06 12:01:53 PDT (-0700)

We just won’t know. Luckily, I was told there was abundant mycelium and that this single one had been knocked over. We should see more soon!


looks very much like my obs.
By: Britney Ramsey (Riverdweller)
2011-10-06 11:18:44 PDT (-0700)
By: Danny Newman (myxomop)
2011-10-06 11:02:11 PDT (-0700)

should be white-to-slightly ruddy at first (unless it has been thoroughly handled), staining yellow to orange directly when cut then darkening to red, and be generally lepiotacious in appearance (broadly convex, darker at disc-lighter at margin, etc). not seeing anywhere near enough of these characteristics here to call this L. americanus, but it sounds like you’ll have the opportunity to collect more soon, so we’ll see.

what about that reticulum? is it a reticulum?

By: Rory Pease (Rory Pease)
2011-10-06 08:37:35 PDT (-0700)

We will most find out for sure over the next couple of days. There is a great chance of another specimen appearing.

Created: 2011-10-05 20:05:57 PDT (-0700)
Last modified: 2017-06-13 20:51:40 PDT (-0700)
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