Proposed Names

-3% (6)
Recognized by sight: The red on the cap lends to B. regius. I have seen the red wash out as the mushroom matures
-14% (4)
Recognized by sight
57% (2)
Recognized by sight

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= Observer’s choice
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Blueing B. regius in America
By: Andreas Gminder (mollisia)
2009-06-11 07:04:34 CDT (-0400)

I would subscribe to the opinion of Gerhard, but as I’m not familiar enough with the amercian bolets flora, I don’t dare to judge whether those californian blueing regius are different enough from the eastern speciosus to separate them on species level. The distinction of a species with “slender stem” againt one with a “thickset stem” is not very convincing to me ….

@Dan: citation from ARORA, p. 560
By: Andreas Gminder (mollisia)
2009-06-11 07:01:17 CDT (-0400)

ARORA is describing B. regius as a blueing species. “Flesh […], slowly and erratically or irregularly blueing when exposed” – “Pores […], usually blueing when bruised”. And in his Comments he states following: “This sometimes massive bolete can be told by its blue-staining yellow pores, […]. B. speciosus is a similar eastern species with a longer, slimmer stalk and a tendency to stain blue more readily”.
So far ARORA, but it is evident from decription and plate of KROMBOLZ, that B. regius is a non blueing species and this is how we find that species here in Europe.
We also have a blueing species here in Europe, which is called B. pseudoregius (= B. fuscoroseus, = B. speciosus ss. SINGER 1967 and ss. auct. europ.). But that differs not only in blueing flesh, but also in other colour of the cap and also in another structure of the cuticule (more fibrillous then B. regius). This B. pseudoregius from Europe is not identical with the american B. speciosus. Here SINGER (1967) was not right, e.g. the spore width i quite different between the two.

This is in urgent need
By: Gerhard Koller (Gerhard)
2009-06-11 06:35:13 CDT (-0400)

of a new name … in my humble opinion this is neither B. regius nor B. speciosus but of species of its own. All observations cited here as B. regius at least those from California strongly bluing are comprised of a separate species distinct from European regius and American speciosus … and it would be good if Arora and Simonini would give this a new name too as they did with B. rexvernis.

Can you please elaborate Mollisia
By: Dan Molter (shroomydan)
2009-06-11 03:55:25 CDT (-0400)

My copy of Mushrooms demystified has gone missing, I would like to know what Arora said and why it is wrong.

A pity that someone re-changed the name to B. regius
By: Andreas Gminder (mollisia)
2009-06-11 03:27:57 CDT (-0400)

Boletus regius is a non-blueing species, so this can’t be B. regius. ARORA stating the flesh as blueing is not correct, sorry.

Boletus regius vs. speciosus
By: Andreas Gminder (mollisia)
2009-06-09 17:50:00 CDT (-0400)

Please be aware of the fact, that Boletus regius ss. orig. is a non-blueing species! The bluing regius-like boleti in America should all be B. speciosus. Whether the non-bluing regius-like species in America are the same as the original european regius has to be verified.