Observation 122028: Agaricus L.

When: 2012-11-30

Collection location: Wildcat Canyon Regional Park, Contra Costa Co., California, USA [Click for map]

37.9299° -122.2907°

Who: Nimmo (barky)

No specimen available

Absolutely spectacular bleeding going on, even before handling.

No idea what this is. Found in grass under Coast Live Oak and California Bay, coyote brush and blackberry bramble.

Proposed Names

27% (1)
Recognized by sight
56% (1)
Recognized by sight
55% (1)
Recognized by sight: White, common, intense yellow staining on base, should smell phenolic/bad.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Byrain
2013-01-05 04:18:49 CST (-0600)

are hard to id through pictures, good staining info and smell helps a lot. I’ve seen what looks like tiny A. xanthodermus too, bad/phenolic odor, strong yellow staining especially in KOH, but small enough to fit inside a tackle-box comfortably.

As for the bleeding, here is an obs of Coprinus comatus doing something similar.


Pretty mini for a xanthodermus
By: Nimmo (barky)
2013-01-05 00:15:59 CST (-0600)

Byrain- it was quite a bit smaller than most A. xanthodermus i’ve encountered, and the yellowing was not something I noticed. unfortunately. there weren’t any others nearby. but it could be…

Base was definitely bulbous!
By: Nimmo (barky)
2013-01-05 00:00:37 CST (-0600)

I don’t remember yellow on the base, but inspecting the other photos it looks like there could have been a little. I do remember rose coloration here and there on the stalk and annulus.

Smelled phenolic if i remember right. The main thing I remember was thinking this must be the famous “bleeder”, and surely the folks on MO would know. I don’t know what I thought “the bleeder” was. Ha!

But the “blood” was reddish, even on my hands.

very intriguing Agaricus!
By: Debbie Viess (amanitarita)
2013-01-04 21:09:33 CST (-0600)

did you smell it? odor, phenolic or sweet or “mushroomy” are good clues.

am I really seeing such a round bulbous base?

Is there a bit of yellow at that bulb, too?

Agaricus have chocolate brown spores so the red drops are not from spores…I have never seen red drops on gills before! Very cool.

I think that you are right and that it was rain related.

No rough stipe -
By: Nimmo (barky)
2013-01-03 02:12:40 CST (-0600)

probably not A. benesii

This mushroom was seemingly dripping reddish liquid from the gills.
It could have been the staining action of the spores or other parts, it was a wet day.

Created: 2013-01-02 22:42:44 CST (-0600)
Last modified: 2013-01-04 21:24:46 CST (-0600)
Viewed: 58 times, last viewed: 2017-06-15 05:44:17 CDT (-0500)
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