Observation 23090: Leccinum Gray

When: 2009-07-10

Collection location: Forest near Elgin St., Pembroke, Ontario, Canada [Click for map]

Who: Paul Derbyshire (Twizzler)

No specimen available

But not L. subglabripes. Cream pores rather than yellow, white stem with black scabers rather than yellow, and very very tiny pores. The last several photos are attempts to get decent pore shots. The area in those photos is maybe a centimeter wide or less. I realized that at over 3000 pixels the individual image pixels at that scale must be only a dozen or so microns wide, if not less, so these pores are 1/10 mm or smaller. Yikes!

Found in Zone 13.

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Add Comment
By: Irene Andersson (irenea)
2009-07-13 04:08:48 CDT (-0400)

If anyone here has access to The American Midland Naturalist Journal vol.37, please share Singers description of Leccinum testaceoscabrum with us…

The species name
By: Dave in NE PA
2009-07-12 20:14:39 CDT (-0400)

is credited to Singer and the reference listed by B/R/B is
“Am. Midl. Nat. 37: 123. 1947”.

The problem is -
By: Irene Andersson (irenea)
2009-07-12 14:27:04 CDT (-0400)

- what IS testaceoscabrum actually? I can’t find any original description, I don’t know where it was described from. It is regarded a “nomen nudum”, it just can’t be used because no one can tell for sure what taxon it should be applied to – and I wonder how on earth it could have been synonymized with Leccinum versipelle..

By: Dave in NE PA
2009-07-12 10:40:14 CDT (-0400)

does not mention the dark pore surface of the young L. testaceoscabrum fruit body…“whitish to olive buff or pale grayish when young.” Common name “Orange Birch Bolete.” B/R/B mentions that there have been reports of gastric distress associated with eating this type.

Too pale tube surface
By: Irene Andersson (irenea)
2009-07-12 07:26:10 CDT (-0400)

I don’t know how testaceoscabrum was described originally by Secretan/Singer. If it really is a synonym to versipelle, this can’t be it. The tube surface on a young versipelle is black, and this is definitely young enough. It should at least still have been grey.

An interesting suggestion, though.
I had a look at the description of testaceoscabrum by A.H.Smith in “The Boletes of Michigan” (page no. 140), and he does NOT describe L. versipelle..

By: Dave in NE PA
2009-07-12 00:12:43 CDT (-0400)

says that L. versipelle is a potential synonym for L. testaceoscabrum, which is listed as occurring with birch, among others. So this looks like a good start.

Betula and Populus, maybe Pinus
By: Gerhard Koller (Gerhard)
2009-07-11 16:28:28 CDT (-0400)

they do count. This almost looks like the common L. versipelle if that critter does grow in America.

By: Paul Derbyshire (Twizzler)
2009-07-11 09:49:30 CDT (-0400)

Want a list? Pinus strobus, Pinus banksiana, Betula papyrifera, Populus tremuloides, Quercus sp., Picea sp. all seen nearby, and I wouldn’t rule out Pinus rubrus, Abies balsamea, Acer sp., and Prunus sp. potentially lurking nearby.

For a nice discussion
By: Dave in NE PA
2009-07-11 09:41:13 CDT (-0400)

of the reddish capped Leccinums, see 23065. The species of tree associated with a given Leccinum is important.

Created: 2009-07-10 22:50:27 CDT (-0400)
Last modified: 2010-02-04 10:37:11 CST (-0500)
Viewed: 73 times, last viewed: 2017-06-06 01:34:47 CDT (-0400)
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