Observation 62754: Buchwaldoboletus sphaerocephalus (Barla) Watling & T.H. Li

When: 2010-09-01

Collection location: Stinson Beach, Marin Co., California, USA [Click for map]

37.907° -122.678°

Who: Debbie Klein (dejaklein)

Specimen available

I posted pictures to an Internet mushroom group, and it was suggested that it was Boletus orovillus or Buchwaldoboletus sphaerocephalus. It was similar to observations on this site and at Mykoweb.

The cap was 7 inches (17.78 cm) long in one direction and 8 inches (20.32 cm) long in the other, the stem was 2 1/2" wide (6.35 cm) and 2" (5 cm) long.

I saved and dried the mushroom in slices and young whole fruit bodies that were attached to the larger mushroom. I have some of it in Berkeley, California, and Debbie Viess has some of it in Oakland, California.


The mushroom was behind the log in this picture, growing in wood chips. I think the tree is a kind of cedar, and will check on that. The tree is between a lagoon and the ocean, thus gets a lot of fog and a temperate climate.
Copyright © 2011 Christian Schwarz
Christian Schwarz did microscopy on the mushroom, and here is his picture of the spores. He finds them a bit large to be Boletus orovillus, and instead sees them as a better match to Buchwaldoboletus sphaerocephalus (Barla) Watling & T.H. Li. See Observation 67261.

Proposed Names

57% (1)
Eye3 Eyes3
Based on microscopic features: by Christian Schwarz

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
The pours got very dark
By: Debbie Klein (dejaklein)
2011-05-12 22:52:49 PDT (-0700)

and there was just a bit of staining in the flesh of the stipe.

Blue staining is clearly visible
By: Christian (Christian Schwarz)
2011-05-12 22:49:49 PDT (-0700)

in the sections on the lower photos.

This has
By: damon brunette (damonbrunette)
2011-05-12 22:23:36 PDT (-0700)

orange pores and no staining?

Added photo of microscopy by Christian Schwarz
By: Debbie Klein (dejaklein)
2011-05-12 22:17:24 PDT (-0700)

Christian Schwarz did microscopy on a dried specimen from the mushroom. He found the spores to be closer to Buchwaldoboletus sphaerocephalus (Barla) Watling & T.H. Li. See photo and Observation 67261.

See notes I added under tree photo.
By: Debbie Klein (dejaklein)
2011-01-23 18:26:35 PST (-0800)
Any info on Habitat??
By: Charles Seltenright Sr (Shroomin Yooper)
2011-01-23 18:06:41 PST (-0800)

Created: 2011-01-23 14:44:21 PST (-0800)
Last modified: 2012-12-03 12:24:59 PST (-0800)
Viewed: 183 times, last viewed: 2018-02-24 08:36:33 PST (-0800)
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