Observation 308471: Leccinum subsect. Scabra

When: 2017-09-22

Collection location: Emerald Lake State Park, Dorset, Vermont, USA [Click for map]

Who: cmy610

No specimen available

Light brown/tan cap, white pores that were deeply sunken next to the stem. Pores bruised brown. Stem had scabers and a bulbous base. Growing on the ground in a mixed forest.



Proposed Names

46% (2)
Recognized by sight
64% (4)
Eye3 Eyes3
Recognized by sight
46% (2)
Used references: See comment below

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: cmy610
2018-02-13 08:48:56 PST (-0800)

so much for your help! I wish I had a specimen, but will start collecting specimens in the future.

Very good
By: I. G. Safonov (IGSafonov)
2018-02-10 15:10:37 PST (-0800)

So this is definitely a birch associate, which places it into the subsection.
As to the species, L. scabrum is a possibility, but more info is obviously needed for this collection. The best description of L. scabrum, the iconic European taxon, is that of den Bakker and Noordeloss (Persoonia 2005):
“Characteristics — Habit slender to robust, small to medium-sized; pileus ranging
from light brownish to dark brown; stipital squamules light brownish to blackish, coarse in the lower half of the stipe and usually fine, almost glandular in the upper half of the stipe; context always without bluish discolorations. Mycorrhizal with Betula in (dry) acidic habitats.
Pileus 52-130 mm, convex at first, expanding to plano-convex, with entire, deflexed or inflexed margin, not or only very slightly (< 1mm) extending over tubes, yellowish brown to dark brown (Mu. 10 YR 6/6, 7.5 YR 3-6/4); minutely tomentose, breaking up into minute, appressed squamules with age, somewhat viscid when moist. Tubes broadly adnexed, 8-19 mm long, segmentiform to subventricose when mature, whitish when young, brownish grey when mature. Pores greyish white, often with brownish spots, discolouring brownish when bruised. Stipe 82-145 × 12-55 mm, cylindrical to clavate, whitish, often more brownish towards apex, entirely covered with blackish to greyish, sometimes pale brownish squamules, fine at apex, becoming gradually coarser towards base, sometimes agglutinating and almost forming a network. Context whitish, not changing colour when bruised or at most discolouring pinkish or reddish (K. & W. 9A2), finally often brownish or slightly greyish after several hours.”

By: cmy610
2018-02-10 09:25:20 PST (-0800)

I don’t have much that is helpful to add, but can confirm that this forest was mainly hemlock with some birch and pine. Some maple too, I think. I don’t remember seeing any oak though.

The photographic evidence implies…
By: Dave W (Dave W)
2018-02-10 04:38:17 PST (-0800)

hemlock, birch, and no oak. I agree, this is a typical forest type throughout much of VT. I’ve never IDed anything from hemlock/birch woods as albellum.

By: I. G. Safonov (IGSafonov)
2018-02-09 19:48:01 PST (-0800)

Yes, the notes say mixed woods, but look at the pix, Dave. The ground is covered with hemlock needles and twigs, with a few birch leaves blown over. The location is in VT, so the type of woods described above is very typical of the area. I am pretty sure you see something similar in your neck of the woods, Dave. This is not the kind of habitat where one typically finds L. albellum, even if some oak is mixed in.
I think your 280250 is likely to be L. albellum, and I voted “promising” for that obsie.

Habitat here listed as “mixed woods”.
By: Dave W (Dave W)
2018-02-09 18:57:04 PST (-0800)

But I don’t see anything more specific about types of trees. I find albellum in mixed hardwoods with oak present. I agree about the stocky stature of this one favoring Leccinum. But I’m not sure about the consistency of this trait. Here’s a fairly ambiguous example that I IDed as albellum obs 280250. Do you think it may actually be a Leccinum?

By: I. G. Safonov (IGSafonov)
2018-02-09 18:02:03 PST (-0800)

Yes, agreed – those are the features not associated with Leccinellum albellum. That species usually is more graceful and slender in appearance; its color scheme ranging from having pure white cap and stipe to brownish cap and stipe with gray scabers; the cap is frequently corrugated/pitted, but can occasionally be smooth.
The species shown here is very stocky and more substantial in its appearance. Furthermore, the featured boreal habitat of hemlock with some birch and perhaps other hardwoods is not consistent with L. albellum – an oak-associated taxon favoring pure deciduous woods.

Brown-staining pores…
By: Dave W (Dave W)
2018-02-09 17:24:31 PST (-0800)

fits better with the light-capped “scabrum” types. Also, the tight mosaic of cracks on the cap surface seems to fit better with Leccinum subsect. Scabra.

Created: 2018-02-09 06:41:13 PST (-0800)
Last modified: 2018-02-13 08:48:57 PST (-0800)
Viewed: 135 times, last viewed: 2018-08-24 00:01:01 PDT (-0700)
Show Log