Observation 33685: Agaricus micromegethus Peck
When: 2010-02-16
No herbarium specimen

Notes: Found in mixed woods. Cap only 4.2 cm across.
Brown spores approx 5.0 X 3.8 microns.
The cap seems a little darker than most A. semotus but with the rhizos and yellowing with KOH, it seems to be the closest fit.

Proposed Names

-10% (4)
Recognized by sight
4% (3)
Recognized by sight: Reddish cap, different stem
83% (1)
Recognized by sight
Used references: I also looked up with original publication by Peck and confirmed this spelling.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Size, colours, discoloration and spore size
By: Irene Andersson (irenea)
2010-02-18 10:22:06 CET (+0100)

fits well with the group of Minores around semotus and micromegethus, but this doesn’t look like any of them.
Peck’s description of micromegethus is pointing in particular at the strong rusty brown cap center. A good picture of a possible micromegethus can be found here:

Agaricus micromegethus has to be the proper name, because Peck named it so, and also repeated it in several reports)

Oh boy…
By: Christian (Christian Schwarz)
2010-02-18 01:51:09 CET (+0100)

Fred Stevens’ photo on MykoWeb of A. micromegathus looks a lot more like what I called A. semotus in the obs. I referenced, which makes me think that I have misidentified my collections. It also makes your observation more likely to be A. semotus.
I am at a loss.

Democracy in action
By: Ron Pastorino (Ronpast)
2010-02-18 00:32:23 CET (+0100)
as I seem to be overruled by a 2/3 majority.

It well could be A. micromegathus. I went with semotus because of the habitat ( clearly wooded/no grass), the basically smooth stipe and the rhizos at the base.

How about…
By: Christian (Christian Schwarz)
2010-02-17 23:40:31 CET (+0100)

Created: 2010-02-17 22:23:35 CET (+0100)
Last modified: 2010-02-17 22:23:35 CET (+0100)
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