Observation 133206: Agrocybe pediades (Fr.) Fayod

When: 2013-05-07

Collection location: Jasper Co., Missouri, USA [Click for map]

Who: Jon Shaffer (watchcat)

No specimen available

Proposed Names

2% (2)
Recognized by sight
51% (3)
Recognized by sight
2% (3)
Recognized by sight: Spore print color.
57% (4)
Eye3 Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Byrain
2013-05-15 02:37:22 JST (+0900)

What makes this so definitely Agrocybe pediades? I would love to know. :)

Jon, trying out a…
By: Dave W (Dave W)
2013-05-12 00:15:56 JST (+0900)

flashlight pointed at your spore mount can’t hurt. Maybe some information on size/shape happens?

Found on old bale of straw (my archery target).
By: Jon Shaffer (watchcat)
2013-05-10 22:46:33 JST (+0900)

I’ll take a close-up of the gill attachment. Also, I have an old un-lit 400X scope but…..not sure of its usefulness looking at spore shape or size.

I tried to edit it
By: Byrain
2013-05-10 15:09:26 JST (+0900)

but it needs an admin to review the change, so soon.

Thanks for the info, Byrian.
By: Dave W (Dave W)
2013-05-10 15:02:54 JST (+0900)

When I attempted to post “Agrocybe semiorbicularis” MO provided two versions. I just chose the one with the larger number of usages. Perhaps someone should edit the available choices?

By: Byrain
2013-05-10 14:36:19 JST (+0900)

A. pediades is a variable species and other macroscopically similar species would include A. ochracea which is very close except with pleurocystidia (This observation might have too much of a veil for this), some species with an indistinct germ pore, and maybe some other species not included in European sources like fan6…

Also, you need a . after Bull in Agrocybe semiorbicularis (Bull) Fayod.

Yeah Rich. But the pediades I find…
By: Dave W (Dave W)
2013-05-10 14:31:43 JST (+0900)

is generally terrestrial in grassy areas. This may be one difference that had accounted for the apparently now defunct split in species names. Looks like pediades is the currently accepted name for these types.

By: Richard Kneal (bloodworm)
2013-05-10 14:23:02 JST (+0900)

it appears to me that they are growing from hay…
which, may as well be grass…
don’t you think??

Byrain, I have noticed that some sources…
By: Dave W (Dave W)
2013-05-10 14:15:17 JST (+0900)

list these species names as synonyms. The only Agrocybe I know that has gills that aren’t close-to-crowded is pediades. My concept of pediades is a small lawn-inhibitor. So I proposed semiorbicularis as an alternative, on account of the non-standard pediades habitat. I understand that one needs more than macroscopic traits to totally sort out this type of thing. But these look like a largish non-lawn inhabiting pediades to me.

By: Byrain
2013-05-10 13:59:19 JST (+0900)

A. semiorbicularis is a synonym of A. pediades.


Fan6 also claims this, I think we need microscopy to even try to get a good name on this.

Nice info, Jon.
By: Dave W (Dave W)
2013-05-10 13:24:48 JST (+0900)

Against the black I see brown, lacking in the very dark purple expected for some of the Hypholoma prints.

Gill spacing is not real close. So I’m thinking A. semiorbicularis or A. pediades.

Actually, this spore print color…
By: Dave W (Dave W)
2013-05-10 00:20:48 JST (+0900)

does match pretty well with the one seen here.
Time of collection seems to favor Agrocybe. But Kuo mentions that Hypholomas also fruit in the spring.

I typically think of Agrocybe print colors as not verging on blackish. If one takes a dark print like this on a black background, then the subtle differences between black, dark brown, and dark purple brown, blackish brown, can sometimes be more easily discerned.

These do remind me of Agrocybe pediades.

Created: 2013-05-09 10:06:09 JST (+0900)
Last modified: 2013-05-15 02:33:16 JST (+0900)
Viewed: 143 times, last viewed: 2017-06-16 12:40:35 JST (+0900)
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