Observation 276978: Agaricales sensu lato

When: 2017-05-18

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

Who: Dave W (Dave W)

No specimen available

Notes:
On hardwood.

Colors seen in second photo (in-situ) are not accurate due to low light.

Images

Color is muted in low-light photo.

Proposed Names

-40% (3)
Recognized by sight: Cap surface smooth.
Based on microscopic features: Spores 7-8 × 4-5.
51% (3)
Recognized by sight
-15% (4)
Recognized by sight
31% (3)
Recognized by sight

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= Observer’s choice
= Current consensus

Comments

Add Comment
Spore morphology…
By: Dave W (Dave W)
2017-05-22 14:29:57 CEST (+0200)

as well as may be determined from the photo, matches K. mutabilis; size, shape, color in KOH, germ pore, non-reactive in Meltzer’s (checked twice using dried gill material). About the lack of partial veil remnants Smith/Hesler mention about the persistent fruit bodies, “In such weathered specimens the veil material may be weathered away to the degree that causes confusion in recognizing the species.”

I’ll take some material to a biology lab and see if I can get a clearer look at the spores.

K. lignicola…
By: Dave W (Dave W)
2017-05-22 02:41:39 CEST (+0200)

Cap color seems vividly yellow for K. lignicola. And the spores are larger than what C du Q reports for this species. But otherwise, this species looks like a possibility. I’ve never ID this species.

I returned to the collection site today, but after searching the 1-2 acre area where I found these, I didn’t succeed in finding them again.

Yes, sodden and a bit deteriorated.
By: Dave W (Dave W)
2017-05-21 17:35:05 CEST (+0200)

So this material may not well represent whatever species they are.

A few of these sat atop a table for a day and have pretty much dehydrated. I scraped a little gill material onto a slide. Viewed with my better scope, the spores appear to be finely verrucose. But… mounted in Meltzer’s there is no dextrinoid reaction, as would be expected with at least some Gymnopilus species. So, I’m wondering, could a dextrinoid reaction be altered/lessened because the material was dehydrated? Perhaps Pholiota makes sense here.

The spot where I found these is off-trail, but I think I can find what I left behind in the woods the other day. I’ll see about getting more material to examine.

Thanks, everyone for your interest in this collection. Material that dried on the table is available for additional study. It looks to be in decent condition despite the mushrooms being past prime.

Dave
By: Rocky Houghtby
2017-05-21 05:12:30 CEST (+0200)

I agree that this probably isn’t Galerina marginata, and if the pilei are as you say, then I also agree that this is most likely Gymnopilus. Still, I hesitate to call this penetrans. perhaps this isn’t a very representative collection due to being sodden and a bit deteriorated.

Thanks Rocky.
By: Dave W (Dave W)
2017-05-21 04:55:18 CEST (+0200)

The middle photo (in-situ) was included to show growth habit. The colors of the fungi are not accurate in this photo. So, if you’re judging gill color according to this photo, then I should have mentioned in the notes about the inaccurate color. I’ll edit this into the notes.

I don’t think the pilei are striatulate, except one portion of the cap seen in the lower right of the first photo shows some grooves along part of the margin. I think this was the result of this cap being underneath another; the gills of the upper mushroom imprinted the grooves.

If the spores are verrucose, it is not strongly so. I get better photos through my old monocular microscope, but this one is kinda beat up. I should have viewed the spores through my newer scope. What is seen in this post are spores with contents somewhat ferrugineus in the KOH mount. Shapes seem somewhat variable, unsymmetrical.

Kuo mentions that the stipe of G. sapineus darkens to brown with age from the base up. The very dark lower stipes seen here did seem unusual to me for Gymnopilus.

There may be a bit of this material remaining. If so, I’ll have another look. I doubt these represent a species of Galerina. The only robust (relatively speaking) wood-inhabiting Galerina that I know occurs around here is G. marginata, and I very much doubt these are G. marginata.

Hi Dave
By: Rocky Houghtby
2017-05-20 23:11:47 CEST (+0200)

The hygrophanous, striatulate pileus; the fibrillose, decorated, strongly fulvescent stipe; the russet coloration of the mature lamellae. Additionally, I can’t tell much at that magnification, but the spores seem to be more or less smooth.
I’m not sure what you have here, but I suspect it might be a Galerina. If it is Gymnopilus, I don’t think penetrans is likely.

Rocky, what about this…
By: Dave W (Dave W)
2017-05-20 22:45:07 CEST (+0200)

suggests it is not “G. penetrans”?

Created: 2017-05-20 14:29:53 CEST (+0200)
Last modified: 2018-05-19 04:42:18 CEST (+0200)
Viewed: 250 times, last viewed: 2019-08-13 02:20:44 CEST (+0200)
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