Observation 111231: Hypsizygus marmoreus (Peck) H.E. Bigelow

When: 2012-09-23

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

Who: Dave W (Dave W)

No specimen available

Cluster growing directly on log. Reminded me a bit of young fruit bodies of Entoloma abortivum. No spore drop :-( No aborted forms in the immediate vicinity; although lots of E. abortivum along the trail. But, growth directly on a log seems to me to be a bit odd for E. abortivum.

Proposed Names

31% (3)
Recognized by sight
30% (2)
Recognized by sight
28% (1)
Recognized by sight
71% (3)
Recognized by sight: Water spots on caps, growing in clusters on dead wood.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Water spots
By: Eric Smith (esmith)
2012-09-28 23:19:17 CDT (-0500)

on the caps are distinctive. The gills and spores match as well. These aren’t so immature as the caps aren’t open! Fried Chicken Mushroom as already noted has a different substrate and cap color. “I’d call it that” again if I could…

Photos of the spores…
By: Dave W (Dave W)
2012-09-27 21:55:34 CDT (-0500)

did not come out very well. But they are small and globose to subglobose (in the 3-5 mu range). This corresponds very well to the size/shape reported for H. tessulatus. Interstingly, Kuo notes that H. tessulatus is often confused with Lyophyllum decastes, except L. decastes does not grow directly on wood.

Since this observation shows a collection of immature mushrooms, I personally find it difficult to achieve ID closure. But I think they are H. tessulatus.

Bob, that sounds like a good proposal.
By: Dave W (Dave W)
2012-09-27 06:57:08 CDT (-0500)

judging from your high level of confidence, I surmise that you have seen similar fruitings of immature H. tessulatus.

I looked at the smash mount of a gill, and I think there were some immature spores floating around. Hopefully, the photo comes out… and is worth posting. If so, I’ll get it posted later tonight or tomorrow.

These mushrooms are quite small, with cap diameters under 1 inch.

Created: 2012-09-25 21:38:16 CDT (-0500)
Last modified: 2014-12-12 08:08:48 CST (-0600)
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