Observation 198021: Leccinum scabrum (Bull.) Gray
When: 2014-09-21
No herbarium specimen

Notes: Yellowish mushroom with areolate caps in age, whitish pores becoming greyer, and sunken around the stipe, becoming pinkish when bruised. Stipe enlarges downwards, white with grey black scabers. Base bruising yellowish as do the tubes. Terrestrial near Betula lenta. Didn’t notice any Carpinus caroliniana in the area, but it is found under other hardwoods.

Proposed Names

0% (2)
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Used references: N.A. Boletes
31% (3)
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Recognized by sight

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Eye3 = Observer’s choice
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Comments

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Don’t care who voted against it.
By: Phil (gunchky)
2015-02-04 19:13:48 PST (-0800)

just want to know what it is. L. luteum is found under hardwoods but has an affinity for "Hornbeam.

Like with many…
By: Dave W (Dave W)
2015-02-04 18:08:39 PST (-0800)

of the pale-capped Leccinum mushrooms I find, I don’t feel confident about what to call this. But L. luteum seems like a long-shot to me. Phil, the observations you reference each exhibit the yellow (as opposed to yellowish-tan) wrinkled cap surface. Also, L. luteum seems to be a rather uncommon species which may be tree-specific.

Maybe this is an example of L. luteum…?

I did not post a negative vote for L. luteum. I simply offered what I believe is a reasonable alternative and included a few reasons for doing so. Someone else voted anonymously against your proposal.

Still disagree
By: Phil (gunchky)
2015-02-04 15:30:59 PST (-0800)

L. luteum also has scabers that are grayish to blackish, and they become areolate due to age/upon expanding. As for the orangish staining near the base, I believe this is a result of injury not an example of slugs feasting upon it and their digestive enzymes causing a color reaction. Look at MO observation 141230, photo #3 and note the colors of young and older specimens. Also peruse MO obs. #173834 and note the pore stains in photo #4.

Phil, the traits you mention…
By: Dave W (Dave W)
2015-02-04 02:47:53 PST (-0800)

all seem to be quite variable in what I have IDed as scabrum, especially the staining/bruising of various parts. As for the aerolate cap surface, this is something I have seen in examples of Leccinum for which this is not listed as a defining trait; probably more weather-related than anything. The yellow on the damaged stipe base may be due to the secretion of a snail.

The more I observe light-capped birch-associating scaber stalks the more I am convinced of the difficulty of putting a species name on these… scabrum, oxydabile, holopus can be difficult tell apart. Michael Kuo is conducting research on Leccinum, and he’s looking for well-documented material this coming season. Get in touch with me for details.

The reason why I suggested scabrum here is because the scabers on the stipe appear to be prominent and dark.

I have not ever IDed L. luteum. But from what I believe to understand from ID sources, this is a prominently yellow-capped type with wrinkled cap surface and small scabers.

L. scabrum
By: Phil (gunchky)
2015-02-03 18:25:55 PST (-0800)

context sometimes brown when exposed; this didn’t change. Pileus glabrous in L. scabrum, this areolate in third photo. Pores in scabrum may stain yellowish; this stains brownish. Scabrum may have bluish green stains near the base, and the context may stain pinkish at the surface or blue near the base.
This has no blue and the stipe surface clearly shows yellowish staining.

Created: 2015-02-03 14:44:40 PST (-0800)
Last modified: 2015-02-14 14:54:24 PST (-0800)
Viewed: 78 times, last viewed: 2016-10-25 06:46:28 PDT (-0700)
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