When: 2008-11-16

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

Who: Debbie Viess (amanitarita)

Specimen available

Found under Bay Laurel.

Species Lists


Proposed Names

86% (1)
Recognized by sight: Tom Bruns IDed it; common at Pt. Reyes/Tomales Bay.
Based on chemical features: turns red in KOH (applied during BAMS’ UCB meeting last night!).

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= Observer’s choice
= Current consensus


Add Comment
If with Bay laurel
By: Daniel B. Wheeler (Tuberale)
2008-11-20 11:37:16 PST (-0800)

this cannot be R. vinicolor. According to Field Guide to North American Truffles, R. vinicolor appears to be species specific with Douglas fir. So … you may have a new species! I know of no Rhizopogon found with that host.

yup, CA Bay Laurel.
By: Debbie Viess (amanitarita)
2008-11-17 17:35:17 PST (-0800)
Leaves from laurel?
By: Daniel B. Wheeler (Tuberale)
2008-11-17 10:30:51 PST (-0800)

The leaves in your photo appear to be from Umbellularia californica, which I call Oregon myrtle. There is another species, California myrtle, which has notched leaves, shrubby habitat, and usually grows within 1-5 miles of the coast in Oregon. Oregon myrtle can reach 150 feet and 8feet in diameter; California myrtle is seldom more than 20 feet tall. Can you confirm which species this was found with?

Other host species?
By: Daniel B. Wheeler (Tuberale)
2008-11-17 10:21:44 PST (-0800)

R.vinicolor is not known under Bay laurel. No Rhizopogon is currently known under that species that I am aware of, although I have found R. occidentalis (not this observation) under Bay laurel. To my knowledge, R. vinicolor is species specific with Douglas fir. Was there, perhaps, a Douglas fir within 150 feet of the location?