Observation 119669: Rhizopogon occidentalis Zeller & C.W. Dodge

When: 2012-12-11

Collection location: Livermore, California, USA [Click for map]

Who: squeeb

No specimen available

Found in hole dug by animal, my guess is wild pig. There were many empty holes around this one.

Proposed Names

-15% (3)
Recognized by sight
28% (1)
Used references: NATS Field Guide to Selected North American Truffles and Truffle-like Fungi.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
It was a good guess.
By: Daniel B. Wheeler (Tuberale)
2012-12-12 06:28:51 CET (+0100)

And looking in an animal hole is an excellent way to find real truffles. BTW, Tuber gibbosum was first found in the 1880’s near San Francisco. So there’s probably truffles near you, at least.

P.S. For photos of the real thing, search here for Tuber gibbosum, Tuber californicum, Tuber oregonense, Tuber melanosporum or Tuber lyonii.

By: squeeb
2012-12-12 03:44:33 CET (+0100)

That was my first stab at one of these, I thought it might have been an expensive truffle :) oh well :)


By: Daniel B. Wheeler (Tuberale)
2012-12-12 03:05:51 CET (+0100)

and wrong, squeeb. Right that it is something similar to Tuber. Wrong that it is Tuber.

Tuber has external veins (venae externae) and internal veins (venae internae). This has external veins, but no internal veins. The veins are bands of sterile tissue in an otherwise solive structure. I think if you put a magnifying glass on this obs. it will have small chambers throughout it.

You have a lot of interesting browning threads, called rhizomorphs, attached to and surrounding the peridium (outside). These are very strong support for calling this Rhizopogon, which is related to Suillus and Boletus mushrooms. Still edible, probably, but mostly edible for animals.

Created: 2012-12-12 02:34:05 CET (+0100)
Last modified: 2014-01-03 06:42:30 CET (+0100)
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