Observation 53954: Boletus

Brought in for the Sept. 27, 2010 identification table of the Oregon Mycological Society.



Proposed Names

7% (2)
Used references: Identified by Dick Bishop, who was manning the Identification Table. Don’t recognize it myself, but could be.
28% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Photos very dark.
By: Daniel B. Wheeler (Tuberale)
2010-09-29 10:34:12 CDT (-0400)

My bad, Christian. Photos are much darker because they were taken without a flash with only high overhead lighting available. Didn’t think about it until after these photos were taken. Context of stipe was rather dark though, and brownish at the least. An atypical Bolete in my experience. Dick Bishop is much more experienced in them than I. It was he that called this B. aureus.

Not sure if it is totally a European species: haven’t researched it that well. But it is included in Smith, Smith and Weber’s How To Know The Non-Gilled Mushrooms, described as “Pileus black to blackish brown when young and then with a hoary bloom or with white pruinose patches, surface moist to dry”. Description given as “Pileus 8-15 (20) cm, various shades of date brown when older (often unevenly colored); context thick, white to pallid, odor and taste agreeable; tubes stuffed with white at first, greenish yellow mature, not staining appreciably when injured; stipe 8-15 cm long, 2-4 cm thick at apex, enlarged downward, solid, white within, surface white at first, remaining pallid or becoming vinaceous brown, reticulate, the reticulum mostly brown in age; spores 12-15 × 4-5 microns; cuticle of pileus of erect 4-5 microns wide septate hyphae.”
“Solitary to gregarious under oak in the fall, California. Unfortunately rather rare, it is one of the best edible species.”
The one odd thing I noticed about it was the brownish context of the stipe flesh where cut: unusual in my experience with Boletaceae. I think “date brown” is an accurate description of the cap colo, and if not B. aureus (given as B. aereus in Smith, Smith and Weber) it is a close cousin.

Can’t see anything in the photos.
By: Christian (Christian Schwarz)
2010-09-28 20:14:18 CDT (-0400)

Also, B. aureus is a European species. We call it B. regineus down here now, but I don’t know if the same entity ranges into Oregon.

Created: 2010-09-28 20:11:17 CDT (-0400)
Last modified: 2010-09-28 20:14:41 CDT (-0400)
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