One thing I wanted to clarify....the texture I used in this picture was not specifically made for the pre-existing model.  It's from a picture I took.  On the tree trunk on the left it conforms pretty naturally to it, except at certain points on the roots.
Thanks, rickymaveety for your suggestions about UV mapping.  Honestly, don't know much about that at all, but I will try to learn.  I'll have to download UV mapper classic and play around with it.