Planted Tank Guru
Join Date: Jul 2010
Location: Huntington Beach, CA, USA
I find it almost impossible to tell for sure what type of wood I find if it is really good and dry. But then it really doesn't matter what type of wood it is. It is often stated that certain woods are bad but that is often just a lack of understanding wood. Wood is made up of fiber with lots of moisture mixed in. If the moisture is gone, the fiber bothers very little.
For tank use, wood that still has sap and possibly tannins left may be a problem. Finding wood that is totally dried by nature is much better than trying to find what kind and how to clear tannins.
That appears to be great wood in perfect condition. I normally would look at the inside to see that there was a pretty uniform color throughout but that one looks fine as is. I'm guessing it was collected after a rain or you've soaked it a bit?
If hard pressed for an ID, I would say it is sycamore. Quite likely you found it down along a creekbed and it is really the root section of several trees which grew together???