Observation 370119: Agaricus L.

When: 2019-06-20

Collection location: Ocala, Florida, USA [Click for map]

Who: MycoDan (MycoDan)

No specimen available


Found beneath shrubs in yard under leaves growing from soil

Proposed Names

53% (2)
Recognized by sight
-66% (2)
Used references: Wikipedia

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= Observer’s choice
= Current consensus


Add Comment
Not bleeding
By: Rick Kerrigan (rwkerrigan)
2019-08-02 10:15:54 CDT (-0400)

Hi. I just want to use this good opportunity to point out that many, many species of Agaricus will look just like these when they have become waterlogged. The pink color appears to diffuse from the gills up through the wet cap tissue to the surface (no one has further details about this phenomenon).

On the other hand, rufescence (‘bleeding’ when strong, also called staining) is a chemical reaction that takes place rapidly on surfaces or tissues when mushrooms in good condition are cut, broken or disturbed. It is restricted to a few groups of Agaricus. The mushrooms shown here show no ‘bleeding’.

Mr. Cohen is correct about the name A. haemorrhoidarius; it is too ambiguous to be used any more… and these mushrooms would not be closely related in any case.

The phenolic odor indicates that they belong to a toxic species in section Xanthodermati, for example A. pocillator is a possibility.

By: MycoDan (MycoDan)
2019-06-20 11:38:30 CDT (-0400)

All pics are same cluster…growing on soil in shaded corner of my yard behind a hedge Bush. They exhibit the pinkish red staining on top of cap but a minuscule about, spore print came out as light brown . And the odor is phenolic or chemical smelling. Thank you so much for helping me on this thus far.

A. “haemorhoidius”
By: Joseph D. Cohen (Joe Cohen)
2019-06-20 11:13:18 CDT (-0400)

The name “Agaricus haemorhoidius” is a misspelling of Agaricus haemorrhoidarius, which is ambiguous. It’s either:
A. haemorrhoidarius Schulzer which (per IF) has been synonymized with Agaricus sylvaticus Schaeff.
A. haemorrhoidarius sensu auct., which (per IF) has been synonymized with Agaricus langei (F.H. Møller) F.H. Møller.

That’s what I figured,
By: Chris Cassidy (cmcassidy)
2019-06-20 11:00:31 CDT (-0400)

However, I believe A. haemorrhoidarius is in the ‘bleeding/reddening’ group of Agaricus (Agaricus sect. Sanguinolenti possibly). This collection doesn’t look like it belongs to that group. This could be in Section Xanthodermatei, due to the flaring annulus, woodland/forest habitat, but that’s only speculation. Also the last photo looks a little different from the first. Was that specimen from the same group as the others?

By: I. G. Safonov (IGSafonov)
2019-06-20 10:52:50 CDT (-0400)

It appears to be a misspelled version of M. Kuo’s https://mushroomexpert.com/agaricus_haemorrhoidarius.html.

That name is already on MO, and I just asked MO admins to merge the misspelled one with https://mushroomobserver.org/name/show_name/1346.

Where I got agaricus haemorhoidius from.
By: MycoDan (MycoDan)
2019-06-20 10:10:53 CDT (-0400)

It was a colleague who proposed it may be agaricus haemorhoidius….bleeding agaricus.. I am not certain of it being either just yet, I’m only certain it’s an agaricus of some variety…trying to find exact match all morning.

Where did you come up
By: Chris Cassidy (cmcassidy)
2019-06-20 09:32:40 CDT (-0400)

With this proposed name, A. haemorhoidius?