Observation 143955: Caloboletus firmus (Frost) Vizzini

Under oak, with pine nearby. Flavor mild.

Spores smooth, olive brown, 8.3 – 10 – 3.2 – 3.6 micrometers. (9.1 × 3.3 mean)

Species Lists


With KOH
Spores 1000x

Proposed Names

29% (1)
Recognized by sight: This species usually has a cap with more red, but it can be a buff color as well. Likely a closely related species.
Used references: Noah Siegel and Jesús García Jiménez
29% (1)
Used references: Gary Lincoff
Based on microscopic features: The spores of this collection are slightly smaller than those of B. piedmontensis

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Noah Siegel (Noah)
2014-06-26 18:10:10 PDT (-0700)

is a Caloboletus and is probably the same as C. frimus.

Yes, of course
By: Gerhard Koller (Gerhard)
2013-08-27 11:43:48 PDT (-0700)

in case they would sue you. Crazy the world has gone!
In my childhood no one but me or max my parents were to blame when I would have fallen from the attic of an old abandoned house we liked to play in or from a high tree I loved to climb up. Today there are no more abandoned houses but cell phones and panicking parents.
How I hate this time now ….
Whatever they say I am old school and I keep eating and enjoying many things new school will never know what they are missing.
And thanks! I am slowly returning to “work”, that means, mycology. But it’s still complicated.

Books, articles, many mushroomers..
By: Jon Shaffer (watchcat)
2013-08-27 10:56:11 PDT (-0700)

Gerhard, (glad you hear you are better, btw) I do not take published material as gospel (I rarely take Gospel as gospel lol) especially since we all know that the authors must protect themselves against lawsuits. I eat red pored Boletes, or have for awhile now with no distress and that is pretty good evidence but experienced mushroomer’s input from guys like you and Alan and others, have great weight in my thinking process. There is a dichotomy on mycetism between old school and new. Old school representing generations of mushroomers who usually, if not always boil their shrooms, new school those who learn from books and other new school teachers. We (old school) eat Gyromitra caroliniana in large quantities and with great satisfaction. They are one of my favorites, if not my favorite mushroom, but they are always boiled. Newschoolers teach and preach Do Not Eat!

Jon, who tells you this is not edible?
By: Gerhard Koller (Gerhard)
2013-08-27 10:33:36 PDT (-0700)

People are afraid of eating red-pored bluing boletes but the European Boletus le-galiae is a good edible if properly cooked. Of course you should not eat it because it is very rare.
Hm, then I would propose Boletus satanas group or something like that. Or just leave it as Boletus spec. …

Nice observation Alan!
By: Jon Shaffer (watchcat)
2013-08-27 10:12:09 PDT (-0700)

I was looking for one of these on MO just the other day. None to be found. Now we have one! A distinctive mushroom, not easily confused with edibles it appears.

Not my idea
By: Alan Rockefeller (Alan Rockefeller)
2013-08-27 09:58:53 PDT (-0700)

A Mexican biologist used this name to apply to this taxon. Clearly misapplied…but that is what she was calling it.

What is satanoides?
By: Gerhard Koller (Gerhard)
2013-08-27 09:52:05 PDT (-0700)

Isn’t that a nomen dubium? The European name satanoides proved to be Boletus le-galiae and some closely related species. Isn’t it deprecated? Or have you Americans re-erected it? Sorry, I am not up to date, had a very dangerous aneurysma recently.

Created: 2013-08-27 08:08:18 PDT (-0700)
Last modified: 2015-09-08 16:30:26 PDT (-0700)
Viewed: 224 times, last viewed: 2018-04-23 09:10:55 PDT (-0700)
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