On woodchips, by the road.

A few spores measured 4.5-6 × 3-4.5.


Proposed Names

57% (1)
Used references: Rick Kerrigan

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Thanks to all
By: Ruzica and Sava Krstic (ruzasava)
2017-11-28 22:05:15 PST (-0800)
Nice find, Sava!
By: Martin Livezey (MLivezey)
2017-11-26 14:40:55 PST (-0800)
Nice photo, spores are typical
By: Rick Kerrigan (rwkerrigan)
2017-11-26 13:40:09 PST (-0800)

You can see how featureless Agaricus spores usually are. Size measurements are about all they have to tell us. A. buckmacadooi has very slightly larger spores than A. deardorffensis but they are so close, it’s hard to use those data with high confidence. When you get a chance to see a phylogenetic tree (based on ITS DNA sequences), though, you will see that the two species are not particularly close relatives.

Great photos Sava
By: Terri Clements/Donna Fulton (pinonbistro)
2017-11-26 09:30:06 PST (-0800)
By: Ruzica and Sava Krstic (ruzasava)
2017-11-26 09:27:24 PST (-0800)

Thank you for your comment. I don’t know A. buckmacadooi (though I know Buck) and I don’t have your book, but I am going to order it now. I added the only microshot I have, in case you can see something useful there.

Tough choice
By: Rick Kerrigan (rwkerrigan)
2017-11-26 08:20:19 PST (-0800)

To my eye it looks a bit more like A. buckmacadooi, but along with A. deardorffensis, both of these largish species are poisonous. It’s tough to separate the two species by eye, but the first one can be darker.