Time to send a small sample to the U.S. Forest Service Forest Products Lab for a free identification. Per their website:
"
The Center for Wood Anatomy Research will identify a maximum of five wood samples per household or business per calendar year as a free public service to U.S. citizens. We try to accommodate inquiries from non-citizens, but such requests are typically assigned a low priority. Persons or businesses in need of more than five identifications per year should seek a private consultant to provide this service."
Check out details for shipping, etc here:
http://www.fpl.fs.fed.us/research/centers/woodanatomy/wood_idfactsheet.php
Non-US citizens are given least priority. PM me if interested - you can send me a sample and them I, as a US citizen, can mail it in if you want. I'm guessing they don't have a waiting list... though they are a government agency so good chance there is red tape of some sort to slow the process down.