Observation 45500: Agrocybe praecox (Pers.) Fayod

These appeared to be growing on the ground along the bank of a road in mixed woods.
The spore print was a pinkish brown and became more brown in KOH.
Spores were ~ 8.0-8.3 X 5.0-6.0 microns, elliptical, smooth and with a smallish germ pore.
The caps were dry and up to 5.0 cm across.
The ring was rather thin and fragile.
There was some white cottony material at the slightly enlarged base.
Could not find cystidia on gills.
Another similar trio was found the next day a few miles away which I will post later.
I’m hesitant to put ascribe a genus to them although there are similarities to Stropharia and Psathyrella.

Proposed Names

47% (2)
Recognized by sight
55% (1)
Recognized by sight: woodland fruiting habitat, yellow staining on cap, lack of cracking on cap surface makes this mushroom (and several that we have also collected in the Sierra this spring) closer to Kuo’s A. praecox species group II (separated thru DNA analysis from the more common, grass-dwelling Agrocybe praecox).

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


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Actually I found one of those.
By: Douglas Smith (douglas)
2010-05-18 08:51:11 CDT (-0400)

For Dennis’ course at Yuba Pass I found one of those Agrocybe praecox. Actually I posted here awhile ago, here it is:


And I actually got a photo of the spores there, so you can use that for comparison in your Agrocybe studies.

Sigh! These Agrocybes are going to drive me to Lichens
By: Ron Pastorino (Ronpast)
2010-05-17 13:55:43 CDT (-0400)

and Doug Smith will be partially responsible. I now have a mental block for Agrocybes and while these two observations(MO #45501) are most likely Agrocybe, I doubt that they would match up 100% under DNA anaysis with Agrocybe praecox. The spores on these were definitely more pinkish brown than those that I have found on the coast and besides the apparent lack of obvious gill cystdia, these had rather unique stipe striations.
I do have vouchers of these collections, so if ever a “true” Agrocbe expert emerges, he/she can perhaps settle the question.
Noticed also that in Dennis Desjardin’s Sierra “Spring Fungi List 1982-2007”,
the only Agrocybe praecox is listed as “Agrocybe aff. praecox”.

Not sure of species -
By: Douglas Smith (douglas)
2010-05-17 04:24:09 CDT (-0400)

But with the medium brown spores there, and the smooth spores with a germ pore, you get Photiota or Agrocybe. With those spores and veil, I don’t know, I’d suggest more Agrocybe. Not sure what the best species might be on that.

Agrocybe should have cystidia, but they can be fairly small, and perhaps lost in the basidia. Also it would be good to see what the cap surface says.

I don’t know Ron, you keep posting these Agrocybe, looks like you are becoming the Agrocybe expert for California, maybe you should go for it…

Created: 2010-05-16 22:18:38 CDT (-0400)
Last modified: 2010-05-17 15:23:42 CDT (-0400)
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