Observation 104566: Leccinum discolor A.H. Smith, Thiers and Watling

found in an aspen grove.


mature cap of L. discolor
Leccinum discolor exposed
color changes with air exposure
color changes with air exposure
color changes with air exposure
shadow or true bluing in crack?

Proposed Names

-29% (1)
Recognized by sight: brownish capped leccinum with white scabers, darkening to brown then black when bruised. Context white, changing to gray/dusky, sl. bluing in base over time.
Based on chemical features: context eventually darkens upon exposure to air; blackens when cooked.
73% (2)
Eye3 Eyes3
Recognized by sight: briefly reddens when flesh is exposed to air, sterile flap at cap margin, growth under aspen.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Leccinum montanum observation
By: Richard Bishop (Leciman)
2012-08-14 01:11:56 CDT (-0500)

I did as you suggested Debbie, my Leccinum montanum? observation is 104939.

L. montanum – - -
By: Roy Halling (royh)
2012-08-10 12:33:06 CDT (-0500)

No, I don’t think what is shown here is L. montanum. See p. 326 of Bessette et al.; that’s my pic from a collection near Luther Pass (not Ebbett’s) identified by Harry Thiers, who described the taxon. L. montanum is in sect. Scabra and is a pale gray brown with no sterile flap at margin of cap. The images in this Obs look like something in the L. aurantiacum group – perhaps L. insigne (flesh fuscous directly) or L. discolor (pink to red before fuscous in the flesh). I would bet on this latter based on the exposed flesh images. At least to my knowledge, that’s some of what Harry had reported from Calif. I have collected L. brunneum (which is brown, not orangey) and L. insigne (orangey) from Yuba, among those aspens, but that was back in the mid-70’s.

Leccinum, while a handsome bolete genus, is a PITA to identify in USA.

those are all good questions, Richard.
By: Debbie Viess (amanitarita)
2012-08-10 09:58:15 CDT (-0500)

My choice of L. montanum was primarily derived from its location in an aspen grove. The material that we took home is too young for spores, but I am attempting to get it to mature a bit…not sure if it will continue to grow after picking like my amanitas do! ;)

I also just wrote to Dr. Roy Halling to get his input. I suspect that he saw the original material from the species description by Thiers, but I could be wrong on that.

The only photo of montanum up on the internet that I could find, other than mine here, is a completely worthless reproduction of the decaying microfiche sheet (currently up on Mykoweb) that came with the original book: all the colors have changed over time to red. Real useful.

There is a good photo of montanum in the Bessettes bolete book, but that won’t help you unless you or someone in your club owns it. Maybe your local library can get a copy? Interlibrary loan rocks!

Also, photo comparison is not always the best way to do ID, esp. with a tricky group like Leccinum, although it IS nice when the photo does seem to match.

Why not put up your sighting of the CO Leccinum right here on MO, and then we can all compare and contrast?

This ID confirmation is still pending, but it IS intriguing. Hope to have more info soon.

Need Info on Leccinum montanum
By: Richard Bishop (Leciman)
2012-08-09 23:39:16 CDT (-0500)

I found some Leccinum in Aspen a couple weeks ago that I thought might be L.montanum but they certainly aren’t the same as your’s. Mine were more scabrum brown and had no sterile margin unlike a couple in your colection. I think your pictures did a really good job of showing the important characteristics of your collection but I’m wondering if you or someone you know has more pictures of L. montanum so I can get a better handle on what they should look like.

Created: 2012-08-09 16:31:03 CDT (-0500)
Last modified: 2012-08-10 12:33:15 CDT (-0500)
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