Name: Butyriboletus D. Arora & J.L. Frank
Most Confident Observations:
Copyright © 2009 Ken Stavropoulos (pennybun)
Copyright © 2016 dario.z (dario13)
Version: 5
Previous Version 

First person to use this name on MO: Christian
Editors: Joseph D. Cohen


Rank: Genus

Status: Accepted

Name: Butyriboletus

Author: D. Arora & J.L. Frank

Citation: Mycologia 106(3): 466 (2014)

Deprecated Synonyms: Boletus regius sensu Thiers, Boletus appendiculatus group, Boletus sect. Appendiculati Konrad & Maubl. ex Lannoy & Estadès

Misspellings: Buytriboletus

Notes on Taxonomy: [Edit]

Type species: Butyriboletus appendiculatus (Schaeffer) D.
Arora & J.L. Frank, formerly Boletus appendiculatus Schaeffer, Fung. Bavar. Palat. 2:
tab. 130. 1763

Butyriboletus persolidus = Boletus appendiculatus sensu Thiers

The red capped cryptic taxa are distinguished by:

Butyriboletus querciregius: Growth almost exclusively with true oak (poss. tanoak) , cap pink to rosy or with yellow areas, in fall along coast; spores up to 15 microns, Q value approximately 3.


Cap deep purplish pink or deep rose when young, growth with conifers or tanoak/madrone, spores up to 17 microns, Q value up to 3.5:
Butyriboletus autumniregius (fruiting in fall in mountains as well as low elevation)
Butyriboletus primiregius (fruiting in spring in mountains)

Butyriboletus abieticola grows with true fir at elevation (rare and local along north CA coast) and has the distinctive pale-patchy cap.

Brief Description:

Boletes with “yellow tube layer that often bruises blue, yellow reticulate stipe, mild flavor and firm yellow-tinged flesh that may … turn blue when exposed.”1

Descriptions: [Create]


Add Comment
Can you get rid of the “deprecated synonym”
By: Oluna & Adolf Ceska (
2014-06-08 02:38:41 WIB (+0700)

I bet that in this case the original typo got stuck there as “deprecated synonym”. The same as my “Niente affat(t)o”.

Created: 2014-06-05 01:53:10 WIB (+0700) by Christian (Christian Schwarz)
Last modified: 2014-06-10 17:51:09 WIB (+0700) by Joseph D. Cohen (Joe Cohen)
Viewed: 243 times, last viewed: 2019-01-24 01:51:04 WIB (+0700)
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