Observation 158101: Rhizopogon vinicolor A.H. Sm.
When: 2014-01-14

Notes: These were found on the ground in mixed woods. They were fully exposed, so I’m guessing that perhaps some animal had previously gathered them from someplace else.
Largest was about 3.5 cm wide X 3.0 cm high.
Did not detect any significant odor.
Spores were ~ 6 X 2.5-2.9 microns.

Proposed Names

29% (1)
Recognized by sight
56% (1)
Eyes3
Recognized by sight
Used references: NATS Field Guide To Selected North American Truffles and Truffle-like Fungi, by Matt Trappe, Frank Evans and James Trappe, c. 2005

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Yes Daniel, and the elevation
By: Ron Pastorino (Ronpast)
2014-01-19 00:31:04 CST (-0500)

is only about 650ft.

Found Alpine Lake.
By: Daniel B. Wheeler (Tuberale)
2014-01-18 13:53:32 CST (-0500)

Not far from Mount Tamalpais. Now I know where all those collections are coming from.

Spores are truncate-ellipsoid.
By: Daniel B. Wheeler (Tuberale)
2014-01-18 13:46:25 CST (-0500)

Also sporocarps do appear young, so spores may have been immature. When mature, interior gleba of sporocarps nearly chocolate brown, gray, or a cinnamon-brown. The vinaceous bruising of the peridium is among the most distinctive of Rhizopogon characteristics. Presence of Douglas-fir nearly clinches it, since Rhizopogon vinicolor is the most collected species submitted to NATS, and there is usually Douglas-fir where NATS collects.

Fully exposed merely indicates that an animal has dug them up, not transported them. Sometimes they place truffles in tree branches to dry, and wind knocks them out of the trees. That is especially true of Douglas-fir Tree voles, which predate heavily on hypogeous fungi.

How high is Alpine Lake? I’m thinking it can’t be all that Alpine in Marin Co.

Yes, there were some Doug firs in the area.
By: Ron Pastorino (Ronpast)
2014-01-17 22:10:35 CST (-0500)

and I did want to call them R. vinicolor.
The spores don’t quite match with what the Trappe book shows,“5.5-8 X 3-4.5” microns, but they probably are a little immature on the whole. Can one say they are “truncate-ellipsoid”? The photo of the spores in the book do not appear obviously truncate.

Was Douglas-fir present?
By: Daniel B. Wheeler (Tuberale)
2014-01-17 14:31:58 CST (-0500)

Peridium looks areolate, vinaceous staining. Rhizopogon vinicolor?

Created: 2014-01-17 11:51:51 CST (-0500)
Last modified: 2014-01-19 00:21:12 CST (-0500)
Viewed: 47 times, last viewed: 2016-08-20 23:43:15 CDT (-0400)
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