Observation 20860: Psathyrella (Fr.) Quél.

When: 2009-05-06

Collection location: Upper Darby, Pennsylvania, USA [Click for map]

Who: Marie (mariegh)

No specimen available

Appeared in a mulched bed. Unknown what wood the mulch is, we just picked mulch up out of a huge pile in the park. Appeared in our yard in the past week after a quick hot spell was rapidly followed by extended cool and rain. 3-5 cm in diameter. Very glossy when wet. Many mushrooms have same pits in them as the first one; not sure if this is due to slugs or a natural occurrence. As you can see in the one picture, stem is hollow, and very fibrous. Flesh is easily broken, not pliable. No latex when gills are sliced. I’m totally a mushroom novice, but I’d really like to know what’s growing in my yard!

[admin – Sat Aug 14 02:07:12 +0000 2010]: Changed location name from ‘Upper Darby, PA’ to ‘Upper Darby, Pennsylvania, USA


Mature (at least, more mature)
In rain, immature
Mature (?)
Mature (?)
Mature (?)
Mature (?) (although the stem looked the same on the immature ones).
Mature (?) (again, same look on stem on immature).
Mature (?)
Mature (?) Will have better spore print tomorrow. This is just from the gills touching the paper.
Bottom of stem as pulled directly from bed.
Close-up of root(?) system

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Marie (mariegh)
2009-05-07 14:49:59 BST (+0100)

They smell like mushrooms to me! Like an oyster or button mushroom does. The smell is extremely faint. Definitely not like cut grass, though.

By: Marie (mariegh)
2009-05-07 14:46:45 BST (+0100)

I’ve attached a few new photos of the base of the mushroom. The root system(??—I don’t know if that’s correct vocab) seems to be connected to the wood chips, although there is also a fair amount of dirt (likely earthworm castings) on the clump as well. In addition to little white tendrils coming out like roots, there’s a delicate fuzzy/cloudy white membrane surrounding the whole base of the stem.

No ring or veil
By: Marie (mariegh)
2009-05-07 14:30:59 BST (+0100)

I was thinking possibly Agrocybe as well, but this mushroom doesn’t seem to have any evidence of a ring or veil, which from a brief online search seems to be fairly characteristic of agrocybe. The stem is perfectly smooth, without any ring, and absolutely none of the edges in the whole patch have remnants of a veil. Are there frequently agrocybes without either of these?
The Psathyrella identification is somewhat compelling as well. The stem does snap very easily, the spore print is an almost ‘bright’ dark brown, and they dramatically change color depending on whether they’re dry or wet. You can definitely see light through the flesh of the cap when wet, though I don’t know if that qualifies as translucent or not.

By: Erin Page Blanchard (CureCat)
2009-05-07 05:17:40 BST (+0100)

Those are an Agrocybe species. The scent will be slightly like cucumber or fresh cut grass. The spores will be light to chocolate brown.

Nice set of photos,
By: Michael W (Michael Wallace)
2009-05-07 04:22:04 BST (+0100)

are they fruiting directly of the wood or from the soil underneath?
Could it be a Psathyrella species?

Created: 2009-05-07 01:24:56 BST (+0100)
Last modified: 2011-05-24 04:13:55 BST (+0100)
Viewed: 154 times, last viewed: 2017-11-17 23:23:39 GMT (+0000)
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