Ganoderma brownii
FungiFamily: Polyporaceae · Genus: Ganoderma

Photo by Darv DeShazer on 2-19-2011. I obtained his permission to upload to Wikipedia. Ieponumos at en.wikipedia · cc_by_sa
About
Ganoderma brownii is a species of polypore fungus in the Ganodermataceae family. It is a plant pathogen and occasional saprotroph similar in appearance to Ganoderma applanatum. This species is restricted geographically to the Pacific Northwest, primarily observed in California. In the San Francisco Bay Area, it is very common on Umbellularia californica.
Summary from Wikipedia
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Growing details and traits for Ganoderma brownii in the Library.
No cultivars in the Library yet — the full profile above covers the species itself.