Observation 179481: Cyclocybe cylindracea (DC.) Vizzini & Angelini

When: 2014-09-14

Collection location: Ricketts Glen State Park, Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

No specimen available

Growing from beneath the bark of a downed dead hardwood.



Proposed Names

53% (3)
Recognized by sight
9% (2)
Recognized by sight
58% (1)
Eye3 Eyes3
Recognized by sight
Used references: Recently updated MO obsies, formerly Agrocybe cylindracea

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Rocky Houghtby
2014-09-25 18:57:35 CDT (-0400)

Obsies. Weird.

A. praecox is a springtime mushroom around here.
By: Dave W (Dave W)
2014-09-21 22:37:12 CDT (-0400)

The habitat is generally spread wood chips.

But Mushroom Expert discusses what it calls “Agrocybe praecox Species III”, which it says may actually be a form of A. acericola. I have collected A. acericola in this area during late summer/early fall in the past. Perhaps this species name should be considered here. A. acericola forms a membraneous annulus, which looks like where these may be headed. Cystidia of A. acericola reported as exhibiting fingerlike projections, which I don’t see here.

By: Elsa (pinknailsgirl)
2014-09-21 07:25:22 CDT (-0400)

Could it be be A. praecox too? Description would fit, micro I don’t know. I saw this photo: http://www.morelmushroomhunting.com/agrocybe_praecox.htm

Soil/humus was trapped between…
By: Dave W (Dave W)
2014-09-20 17:33:29 CDT (-0400)

the bark and inner wood of the presumed host tree. Brown spore print… I should have mentioned this. So not Rhodocollybia. Substrate mix of wood and soil is consistent with some Agrocybe species.

By: Elsa (pinknailsgirl)
2014-09-20 15:26:57 CDT (-0400)

remind me Rhodocollybia, do I see some soil on stipe base?

In the 8th photo…
By: Dave W (Dave W)
2014-09-20 10:09:46 CDT (-0400)

I had intentionally cut away the veil in order to see the gill attachment. So I may have also scraped material off the stipe.

But this is a good point. Perhaps the “fleeting” partial veil of firma is due to exactly what you suggest. In this case I would expect firma to exhibit appendicualte material along the cap margin… at least during some early stage. I haven’t found any report(s) that indicate this.

Another possibility is there are (at least) two species, one with veil and one without. This reminds me of the Tubaria furfuracea/heimalis debate.

By: Richard Kneal (bloodworm)
2014-09-20 09:34:50 CDT (-0400)

look at the 8th photo.

I’m not sure I understand your comment, Richard.
By: Dave W (Dave W)
2014-09-20 09:27:48 CDT (-0400)

Look at the fourth photo. Membraneous veil is (as far as my understanding goes) obvious. Are you saying that this will apparently not adhere to the stipe and form a ring/zone?

there is no veil…
By: Richard Kneal (bloodworm)
2014-09-20 09:15:21 CDT (-0400)

reminiscent on the stipe…
just, the pileus.

My first thought was…
By: Dave W (Dave W)
2014-09-20 01:12:21 CDT (-0400)

“Agrocybe firma”, except the prominent partial veil seemed to not fit. Most sources I have checked report “no partial veil” for A. firma. Champignons du Quebec reports a “fleeting” pv. The mushrooms in this obs feature a thick membraneous pv.

Cystidia in this obs are similar to large cystidia I have observed in A. firma, except the ones I had IDed as firma were capitate. The ones in this obs and bowling pin shaped… except for the tapered base as seen in one photo.

Created: 2014-09-18 22:38:06 CDT (-0400)
Last modified: 2015-01-12 23:57:41 CST (-0500)
Viewed: 196 times, last viewed: 2018-06-19 09:32:59 CDT (-0400)
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