Observation 112120: Gymnopilus penetrans (Fr.) Murrill

When: 2012-09-30

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

Who: Dave W (Dave W)

No specimen available

Spore print rusty. On wood.

Proposed Names

29% (1)
Recognized by sight: Cap is floccose-scaly.
Used references: Discussion on MO.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Irene Andersson (irenea)
2012-10-03 11:35:06 EDT (-0400)

maybe you can call it pileocystidia in sapineus. I have seen it described as clavate to pyriform endcells on the hyphae in pileipellis..

the pileus
By: Rocky Houghtby
2012-10-03 10:47:05 EDT (-0400)

Looks tomentose to me as well

I guess I’m misinterpreting something here…
By: Dave W (Dave W)
2012-10-03 09:49:11 EDT (-0400)

because this cap looks to be scaly to me. Maybe the colors of cap/gills are more important features here?

The mushroom was collected in an area featuring lots of hemlock. So it very well may have come from coniferous wood.

By: Richard Kneal (bloodworm)
2012-10-03 09:28:16 EDT (-0400)

this looks like G. penetrans.
the pileus appears to be glabrous and is yellow to golden all over.
also, the gills are pale yellow, becoming rusty spotted with age.

G. sapineus has a yellowish veil when young.
also, the key to differentiating the species on a microscopic level is based on pileocystidia.
G. sapineus presents with pileocystidia, while G. penetrans lacks pileocystidia.

also, i bet this was on a hardwood rather than a conifer.

If you want to tell them apart
By: Irene Andersson (irenea)
2012-10-03 04:35:40 EDT (-0400)

you should use the microscope:
G. penetrans has smooth hyphae in pileipellis, up to 12 microns broad, most of them much thinner.
G. sapineus has broader hyphae, up to 20 microns, the majority 8-14, and they are incrusted (grains on the surface).

Without a microscope, you need young specimen to observe the thin white veil on penetrans, sometimes seen as a tiny annular zone on the stem, but very soon disappearing. G. sapineus does not have a veil.

Created: 2012-10-02 23:39:51 EDT (-0400)
Last modified: 2012-10-03 09:28:33 EDT (-0400)
Viewed: 182 times, last viewed: 2018-01-12 12:16:35 EST (-0500)
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