Adding cypress, if it's good enough for the swamps of Louisiana it's good enough for us.
Existing list so far. If you see one that's not safe, please post. Does anyone know about Crepe Myrtle?
2. Colophospermum mopane (AKA mopani, mopane drift wood)
3. Chola wood,
4. Rose wood roots,
5. Malaysian drift wood,
6. Ribbon wood