Observation 190477: Butyriboletus querciregius D. Arora & J.L. Frank

When: 2014-11-28

Collection location: Tilden Regional Park, Contra Costa Co., California, USA [Click for map]

Who: Nimmo (barky)

No specimen available

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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sounds good to me, Nimmo!
By: Debbie Viess (amanitarita)
2014-11-29 14:42:09 CST (-0500)

but everything is better with bacon! ;)

a sense of myco-humor is essential these days, as we dodge, dodge, strike! those latin name changes.

but hey, when was life ever simple?

I was going to propose Risottophilus bacononionii…
By: Nimmo (barky)
2014-11-29 13:10:04 CST (-0500)

… but then i checked the new nomenclature.

no worries Shane.
By: Debbie Viess (amanitarita)
2014-11-29 12:09:18 CST (-0500)

Boletus appendiculatus IS Butyriboletus appendiculatus. We just don’t have it here in CA!

Now that we have some working species concepts, we can continue to expand upon them. Fer instance, the querciregius that I just documented here on MO had white context inside of yellow. That isn’t supposed to happen. But when have the mushrooms ever played by OUR rules?

just looked at the enlarged photo …
By: Debbie Viess (amanitarita)
2014-11-29 12:04:29 CST (-0500)

those red tones on the cap say Bu. querciregius. Bu. persolidus has a strictly brown cap.
From the Bu. persolidus comments section, in the Arora/Frank paper: “Clarifying the Butter Boletes,” pg.474 :

“Comments: This species is remarkable even among butter boletes for its thick, dense flesh. The cap sometimes has rusty brown areas but lacks the rose, pink or vinaceous tints of other California butter boletes. It is most likely to be mistaken for Bu. querciregius, which also is associated with oaks. The latter has a distinctly reddish pileus when fresh but faded specimens can approach color of Bu. persolidus. Bu. querciregius, however, tends to be softer than Bu. persolidus and is much more likely to have blushes of red on the stipe (although not consistently).”

Index Fungorum
By: Shane Marsh (Mushane)
2014-11-29 11:59:19 CST (-0500)

I have been following IF for updates

Which explains why I suggested that ID.

both Bu. querciregius and persolidus grow with oaks …
By: Debbie Viess (amanitarita)
2014-11-29 11:56:04 CST (-0500)

and both are new species derived from our former concept of appendiculatus.

the diff is persolidus usually doesn’t have any red tones on the stipe and querciregius often does. Querciregius has reddish tones in the cap, but these can fade with age. Can’t really tell from the photo; could be either one. They are very similar.

I am still working on these new species concepts, how bout u? ;)

I believe the new name for the oak
By: Ron Pastorino (Ronpast)
2014-11-29 11:30:29 CST (-0500)

loving Boletus appendiculatus is now Butyriboletus persolidus.

Bu. appendiculatus …
By: Debbie Viess (amanitarita)
2014-11-29 11:01:01 CST (-0500)

is a European mushroom, and Boletus appendiculatus is the former name for our local oak loving butter bolete.

Bu. querciregius is its new name.

Created: 2014-11-29 02:48:32 CST (-0500)
Last modified: 2014-11-29 12:48:35 CST (-0500)
Viewed: 94 times, last viewed: 2018-01-11 00:25:58 CST (-0500)
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