This is a huge fungus specimen I found along the Obsidian Trail near Bend, Oregon. I come across this type of fungus all the time in the Western Cascades mountain area, but this is by far the largest specimen I have ever seen. It is really huge, perhaps as large as 1.5 feet wide. What species exactly is this? Is it tinder conk?

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1 Answer 1


I'd identify it as one of the Ganodermas - these are particularly associated with foot and butt rot of woody plants, usually trees. The white rim is not uncommon in various of these, and the area beneath the 'cap' or top should be white. Not sure about those white/green lumps on the top though, never seen those before (see comments below - I reckon that's right, they are mirrored sunglasses...)



In theory, yes, though I'd rather say it doesn't seem to be toxic. Certainly some of the Ganodermas are used in traditional medicines. However, you know the old saying about mushroom collectors/eaters... link below (scroll down) gives some very good advice


  • I very unscientifically would identify the two lumps as a pair of sunglasses, presumably positioned by OP, either for artistic reasons, to show the size of the fungus or simply for fun.
    – Stephie
    Commented Nov 1, 2015 at 16:28
  • Oh my word, you're right - they must be mirror ones, reflecting the sky/leaves...! I just couldn't see that till you mentioned it, thanks Stephie
    – Bamboo
    Commented Nov 1, 2015 at 16:40
  • LOL; Yeah, I put my glasses on it to contrast the sheer size of it.
    – Meng Lu
    Commented Nov 1, 2015 at 17:27
  • @MengLu - see updated answer
    – Bamboo
    Commented Nov 1, 2015 at 17:31
  • For the benefit of my curious mind, what will be the practical procedure to effectively get a more exact identification -- what species is it -- given the general identification of a Ganoderma?
    – Meng Lu
    Commented Nov 1, 2015 at 18:15

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