MCA Posted March 27, 2020 Report Share Posted March 27, 2020 This polypore is from the state of Oregon. Quote Link to comment Share on other sites More sharing options...
Dave W Posted March 27, 2020 Report Share Posted March 27, 2020 Knowing the type of wood it was on may be helpful. Possibly Fomes fomentarius, or some other species of Fomes. Quote Link to comment Share on other sites More sharing options...
MCA Posted March 27, 2020 Author Report Share Posted March 27, 2020 I don't know the type of wood it was on. Here is a piece of it chopped off. Maybe that will help to ID this. Quote Link to comment Share on other sites More sharing options...
Dave W Posted March 27, 2020 Report Share Posted March 27, 2020 The different layers of tubes seen in the cross-section is a trait associated with more than one genus of hard-fleshed perennial polypore. Fomes fomentarius is one such species of polypore that exhibits this trait. So, although not conclusive evidence, I'd say the recently posted photo provides good support for the F. fomentarius proposal. Quote Link to comment Share on other sites More sharing options...
MCA Posted March 27, 2020 Author Report Share Posted March 27, 2020 Thanks Dave Quote Link to comment Share on other sites More sharing options...
MCA Posted March 29, 2020 Author Report Share Posted March 29, 2020 I found out this polypore was found on a fallen Douglas Fir tree. I've also heard someone else say it could be Fomitopsis pinicola. Quote Link to comment Share on other sites More sharing options...
Dave W Posted March 29, 2020 Report Share Posted March 29, 2020 Dug out my copy of "Ploypores of British Columbia" (PBC). Some good descriptions in this book. At first I didn't think "Fomitopsis pinicola", because F. pinicoloa generally (but not always) features different colored bands on the upper surface, often with a red or white band near the margin. But, there are some traits here that favor F. pinicola over Fomes fomentarius: 1. cross-section with layers of tubes distinct; 2. growth on Douglas fir (which I didn't know to begin); 3. pore openings quite small. So, I agree this is more likely F. pinicoloa. If you have a way to examine spores with a microscope (at least 400x magnification), then F. fomentarius spores are significantly larger than those of F. pinicola. PBC says that the upper surface of F. pinicola is sometimes completely black. PBC also says that the pore surface of F. pinicola bruises yellow (when fresh), which is evident in the first photo. See * below for one final suggestion regarding F. pinicola. Laricifomes/Fomitopsis officinalis is a Pacific NW species that grows on Douglas fir. It is said that its tube layers are distinct (similar to what is seen here). But, the upper surface of the ones seen here seem too dark and with a substantial pileus, which seems to point away from L/F officinalis. Fomitopsis ochracea is another species to consider. PBC says F. ochracea is sometimes confused with F. pinicola. *PBC offers up a piece of information that one may use to separate F. pinicola from at least some of the look-alike species. If a burning match is held to the upper surface (pileus) of F. pinicola the crust boils. This something I definitely did not know! Thanks for pressing the ID discussion on this one, MCA. I learned a few things about these species of perennial conks. BTW, photo documentation in this thread is really good. Evidence seems very good for Fomitopsis pinicola. Quote Link to comment Share on other sites More sharing options...
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