Observation 25131: Inonotus P. Karst.
When: 2009-09-11
No herbarium specimen

Proposed Names

56% (1)
Recognized by sight: recognized by sight as to genus; found on Tsuga heterophylla in mixed conifer coastal forest
Used references: MD p.570
79% (1)
Recognized by sight: So far as I know, Inonotus dryadeus only grows on hardwoods, almost always oak, and almost always from the roots at the very base near the trunk. This is almost certainly an Inonotus, but would require microscopic examination to speciate.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Inonotus dryadeus
By: Ryane Snow (snowman)
2009-09-24 03:35:08 EDT (-0400)

“[Causes a] white rot of heartwood in butts and roots of living oaks and true firs. … In eastern North America I. dryadeus occurs mainly on oaks. In the southwestern U.S., Mexico, and in the Pacific Coast region it is primarily on true firs (Abies spp.). It is particularly common in stands of fir in northern California.” — North American Polypores by R.L. Gilbertson & L. Ryvarden (1986). David Arora, in a private communication states "They did say the difference in hosts was unusual and they cited Laetiiporus sulphureus as another example. But of course that species has been divided up into several species, now. So it may be that the eastern and western dryadeus are not identical, but until this is confirmed and published then I. dryadeus is the best name for it. It sounds like the specimens you found were unusually high on the tree but would still qualify as being on its “butt.”" Upon rechecking its host, it was found on Grand Fir (Abies grandis)

Created: 2009-09-11 23:05:38 EDT (-0400)
Last modified: 2013-12-01 16:05:13 EST (-0500)
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