Observation 28169: Butyriboletus querciregius D. Arora & J.L. Frank

When: 2009-11-12

Collection location: China Camp State Park, Marin Co., California, USA [Click for map]

Who: Ken Stavropoulos (pennybun)

Specimen available

same spot as last year, under oaks, last year dimitar called it b,regius and a need for more work on this bolete. they are poppin in marin,,

Proposed Names

62% (5)
Recognized by sight
44% (2)
Recognized by sight
85% (1)
Recognized by sight: Yellow reticulate stipe, pink pileus, under oak

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
update picture
By: Ken Stavropoulos (pennybun)
2009-11-13 16:22:16 PST (-0800)

yes after Reading your note, looked again at it,yes small amounts of blue staining was there, see update picture,

By: Erin Page Blanchard (CureCat)
2009-11-13 14:26:34 PST (-0800)

Yeah, I did notice that blue under the immature cap… But yet again, all the other species I can think of stain much more noticeably.

Looks like a weak blue-stainer
By: Nathan Wilson (nathan)
2009-11-13 14:22:15 PST (-0800)

Note the little button off the side of the first image. I has definite blue/green tones in it.

By: Erin Page Blanchard (CureCat)
2009-11-13 13:33:41 PST (-0800)

The only thing I can find that comes even close in description (most specifically, pink pileus, with yellow hymenium and stipe, not changing green or blue) is Boletus pulchriceps… However, I can not find any images of this species, and all of its close relatives DO stain green or blue. B. pulchriceps sometimes stains green or blue, but inconsistently, and if so, weakly.

The description does not match this collection thoroughly, but it is my best guess based on the features noted above.

For full description, see:

this Bolete did not blue stain
By: Ken Stavropoulos (pennybun)
2009-11-13 06:33:21 PST (-0800)

when i gathered up info on B.Regius, it stains blue, this one did not stain blue at all, in the 1st photo the bolete is in 2 parts,

Boletus appendiculatus
By: Erin Page Blanchard (CureCat)
2009-11-13 01:01:15 PST (-0800)

This collection is more close to the European taxon B. appendiculatus. This similar Western US species typically associates with Oak and usually fruits in Fall.

B. sp. aff. regius is more common in the Sierras, especially associating with Pine species.

Neither of these Western species are conspecific with either of the similar European taxa (B. appendiculatus or B. regius).

Created: 2009-11-12 12:50:15 PST (-0800)
Last modified: 2014-06-08 12:45:01 PDT (-0700)
Viewed: 260 times, last viewed: 2018-01-02 19:04:51 PST (-0800)
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