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Observation 238867: Agrocybe Fayod

When: 2016-05-16

Collection location: Wilkes-Barre, Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

Specimen available

Ornamental landscaped area with wood chips, a pine, and an oak. Corner of N. Main St. and W. North St.; campus of King’s College, Wilkes-Barre, PA.


Proposed Names

31% (2)
Recognized by sight
63% (3)
Recognized by sight
28% (1)
Recognized by sight
Based on microscopic features: Lots of caulocystidia.

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= Observer’s choice
= Current consensus


Add Comment
Its a European species.
By: Byrain
2016-05-17 19:09:37 PDT (-0700)

Now found commonly with wood chips on the West Coast, I would not be surprised if it spreads East with transported wood chips. There are some similar looking Agrocybe, but I do not think any of them are known to have such a highly ornamented stipe texture. Given that its not really known from the Eastern US yet I voted only “Could be”. A more certain identification would require some relatively easy microscopic examination following the Agrocybe keys in FAN6, I think you should give it a try it would be a good learning experience. :)

Its pretty easy to see the presence or absence of caulocystidia without a compound microscope, but with A. putaminum its rather exaggerated.

Okay. Observing presence of caulocystidia…
By: Dave W (Dave W)
2016-05-17 19:00:27 PDT (-0700)

does not always require scoping.

I’ll see about using GIMP to modify photos. Not sure how much of a difference it will make. Snapping a photo through one eyepiece of a binocular microscope produces mediocre photo quality.

Thanks for the ID proposal. Not a species name I’m familiar with. Looks like most of the MO putaminum observations are from the west coast.

I have preserved some of this material.

Stem texture
By: Byrain
2016-05-17 17:18:42 PDT (-0700)

The stem is highly grooved which is caused by lots (!) of caulocystidia much like in Agrocybe putaminum. :)

I unfortunately can not make out any useful data from your microscopic images, you should try keying this out yourself. Check your e-mail.

Please do me a favor and crop your microscopic images, at least to remove most of the black borders thanks. A free and powerful program that can do that and much more is gimp.

By: Dave W (Dave W)
2016-05-17 17:03:54 PDT (-0700)

I did not knowingly scope any stipe material (except maybe a little ripped off when I extracted what I thought was only a piece of gill). So I’m wondering about the cystidia being characterized as caulocystidia.

No spore drop thick enough…
By: Dave W (Dave W)
2016-05-17 16:42:04 PDT (-0700)

to determine print color. But, mounted in KOH the spores appear to be brown. Shape (slightly truncate) supports the Agrocybe proposal. Lots of cystidia found along one edge of smash-mounted gill material (which included the edge). So I think they are cheilocystidia. Shapes variable.