Observation 180852: Leccinum Gray

When: 2014-09-27

Collection location: Katellan Trail, Pennsylvania, USA [Click for map]

Who: Dave W (Dave W)

No specimen available

Pale cap color points toward albellus.

Sectioned mushroom slowly developed prominent blue stain inside stipe base, which points toward scabrum.

Oak, birch, and aspen each within 10 feet of mushroom.

Proposed Names

58% (1)
Eye3 Eyes3
Recognized by sight
28% (1)
Recognized by sight: blue staining, asscociated with birch in wet boggy areas

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I think maybe scabrum is the best possibility here.
By: Dave W (Dave W)
2014-10-01 19:51:02 WIB (+0700)

My collections of what I have called holopus have generally come from damp areas with lots of birch, often mixed with conifers. Staining reactions with my “holopus” collections have generally shown some pink and/or blue on the cut context… not unlike snellii obs 149714 .

This one (180852) was found in a dry hardwood dominated area (during very dry weather… which may have influenced my perception of the habitat).

Here’s a recent find of mine, under birch, that matches the general description of scabrum and which has the blue/turquoise stain inside the stipe base obs 178091 .

Can’t rule out holopus for this obs (180852). But I feel fairly well convinced that albellum may be ruled out.

I suppose L. oxydabile is another name to consider.

Hi Dave,
By: Terri Clements/Donna Fulton (pinonbistro)
2014-10-01 04:51:18 WIB (+0700)

I agree that the cap looks too pale for L. scabrum. And from what I’ve seen and read L. albellum has unchanging context.


all the
By: Eva Skific (Evica)
2014-10-01 03:55:25 WIB (+0700)
literature that i have, specifically says that it does not blue.

Color change goes a pinkis-red, slight gray, after they merged Leccinum roseofractum, Leccinum subcinnamomeum, Leccinum avellaneum, Leccinum rigidipes, Leccinum onychinum, Leccinum umbrinoides, Leccinum molle.

But everything is possible, since most of the literature is rewritten and every 5 years they change names of fungi.

Roody reports…
By: Dave W (Dave W)
2014-10-01 00:05:29 WIB (+0700)

that L. scabrum “usually shows bluish green staining at the base of the stalk.” Other reports I have read claim that L. scabrum sometimes shows bluing in the stipe base. Some reports state that L. scabrum never stains blue.

One report I just read says there used to be several different species names that have been combined under the heading “Leccinum scabrum.” So maybe some varieties of scabrum stain and some don’t.

Maybe the one seen in this obs is something other than scabrum or albellum? I don’t have much confidence in any species name for this one.

I thought
By: Eva Skific (Evica)
2014-09-30 20:36:42 WIB (+0700)
scabrum never stains blue

Created: 2014-09-30 08:28:09 WIB (+0700)
Last modified: 2014-10-01 04:48:57 WIB (+0700)
Viewed: 56 times, last viewed: 2017-06-19 11:14:20 WIB (+0700)
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