Observation 112093: Leccinum scabrum (Bull.) Gray
When: 2012-09-23
No herbarium specimen

Notes: mixed woods

Proposed Names

29% (1)
Recognized by sight: tan cap, black scabers, sl. lilac tones in center of context, otherwise pale, unchanging.
61% (2)
Eye3 Eyes3
Recognized by sight: Slight discoloration in context.
28% (1)
Recognized by sight: Slight discoloration in context

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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I understand the difficultly..
By: Bill (boletebill)
2012-10-04 18:23:24 BST (+0100)

…of reporting taxa that are part of a poorly segregated group or cluster or species complex or whatever you might call it. I use the name L. scabrum for this as a placeholder name until the population I’m familar with is better described and gets (or maybe doesn’t get) a better name. It is possible that L. scabrum is a holarctic birch associate or something even more fantastic and if mushrooms could fly and interbreed that way maybe we’d call it a cline?…..but anyway I just use scabrum here because I don’t have a better name for this very common Leccinum.

thanks Bill.
By: Debbie Viess (amanitarita)
2012-10-04 18:03:16 BST (+0100)

I was just reporting what I observed, with little hope of making an ID!

Your conditional scabrum “group” designation noted. Not sure how we are currently dealing with cryptic sp. here on MO.

This is what I call….
By: Bill (boletebill)
2012-10-04 17:01:12 BST (+0100)

Leccinum scabrum group, very common in stands of early succession black and yellow birch stands and it fruits both early in the season(June) and late in the season (Sept) in CT. Personally I don’t find pale pinkish staining in the cap-stipe flesh junction OR greenish staining (or the lack of either) at the base of the stipe flesh to be very consistent characters in these cluster of birch related Leccinum whatevers.

I think this makes a reasonable case…
By: Dave W (Dave W)
2012-10-03 21:35:50 BST (+0100)

to at least suppose scabrum as an ID. Phillips notes “flushing pale pink” of the context. I have seen this type (and other birch associates) where only one small birch sapling could be found.

http://www.rogersmushrooms.com/...

I think holopus is mainly a northern species, and I don’t know L. schistophilum, which Irene mentioned… so that’s another possibility. Like you say Deb, we probably won’t get to the bottom of this one. But it’s fun trying :-)

ah, so many different birch trees…
By: Debbie Viess (amanitarita)
2012-10-03 20:00:38 BST (+0100)

the only one I know from the Midwest North Woods is the paperwhite. that one wasn’t around.

the yellow leaf w/parallel veins does indeed look like a chlorosing yellow birch leaf, thanks to my handy dandy Sibley Tree Guide. BUT! one blown leaf does not a slam-dunk symbiont make.

the lilac color inside the fruit body was in the center of the stipe only, very faint and unchanging.

does that help put a name? I kinda doubt it, but have it at Leccinum fans.

OK, thanks!
By: Irene Andersson (irenea)
2012-10-03 18:21:32 BST (+0100)

Another birch associate is Leccinum schistophilum, which can get a slight pinkish discoloration in the cap and upper part of the stem.

The yellow leaf in the second photo
By: Noah Siegel (Noah)
2012-10-03 18:08:46 BST (+0100)

is either a Yellow Birch or a Black Birch. Both are very common there and were the only trees turning color during Debbie’s stay in NC.

What about that greenish leaf…
By: Dave W (Dave W)
2012-10-03 18:06:27 BST (+0100)

just behind and to the right of the mushroom in the second photo? Looks like it could be birch.

I can’t see any birch leaf in the pictures..
By: Irene Andersson (irenea)
2012-10-03 17:47:11 BST (+0100)
there is a birch leaf in the picture…
By: Noah Siegel (Noah)
2012-10-03 17:40:12 BST (+0100)
Well, that’s interesting…
By: Dave W (Dave W)
2012-10-03 16:36:55 BST (+0100)

L. scabrum is a birch associate. I think L. holopus is also a birch associate… but my Big Bolete Book is at home and I am not.

L. albellum is an oak associate. Sometimes I do find that “non-staining” Scaber Stalks exhibit some minor darkening of the cut context. But what you have described, Debbie, sounds like the staining/bruising where the cap context merges with the stipe context… a staining trait quoted as a good character for at least a few Leccinum species.

definitely NOT birch….
By: Debbie Viess (amanitarita)
2012-10-03 16:14:50 BST (+0100)

which is just about the only eastern tree sp. that even I can recognize. ;)

L. albellum shows …
By: Dave W (Dave W)
2012-10-03 13:45:03 BST (+0100)

no change in color of cut context. So it seems like we may rule out this one.

Birch?

Created: 2012-10-03 03:46:33 BST (+0100)
Last modified: 2012-10-04 18:18:00 BST (+0100)
Viewed: 116 times, last viewed: 2015-09-12 19:31:18 BST (+0100)
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