ID? A polypore that digests OSB plywood

Last winter a cluster of lovely polypores exploded out of the corner of an RV I'm staying in. It's been getting beat on by our 66" of rain for years. I couldn't figure where it had come from.

As you surely know, OSB (oriented strand board) is one of the gickest and cheapest (so, ubiquitous) lumber products. It's widely deployed in RVs. I was gutting part of this RV and found, among other astonishing decays, the OSB flooring shot through with mycelia. I realized that the polypore cluster had fruited from mycelia colonizing one-fifth of the trailer, at least, and that it was eating something so toxic it can't be burnt or put near waterways. And rural folk love to save on dump runs! (Sadly, for many that means "throw it in the back 40".)

What is this thing? I have no plans to eat it or use it for medicine lol, but I wonder if the culture should be encouraged somewhere on the property for remediation purposes. I piled the myceliated gutted OSB in a shady non-food area and wonder how long before it is gone.

I don't recognize it. I agree with you not to consume it in any way.  I would try to key it out or seek help on Facebook ID groups.
John S
PDX OR

Maybe Paul Stamets would like to culture it and/or give you an ID?

OSB eating sounds like something he would want in his collection.

info@fungi.com
Phone: 360-426-9292

Looks like a carpet fungus to me.  Peziza domiciliana  

From my point of view, it doesn't look like a cup fungus such as peziza.
John S
PDX OR

Craig Dobbson wrote:Looks like a carpet fungus to me.  Peziza domiciliana  

Looking at the Google images for it, I think it IS that. Will read to see if it commonly eats OSB and update.

A Stamets facility is very close to here, I think it's a shipping warehouse. Would be an honor to deliver a OSB EATICUS there

Here is more info on Peziza domiciliana.
http://identification.growing-mushrooms.com/mushroom/peziza-domiciliana-1181/
Best to go through all the steps for keying it out.
Most pezizas really look like a cup fungus, and this one doesn't.  In some of the pictures, this fungus looks more like a cup fungus. In others, it doesn't. I won't decide for you, but I will give you information to help you decide.
John S
PDX OR