I saw it called the tree bark pattern. It does resemble the pattern though. I used the "teardrop" tool of my woodburning tool and used the flat side to make my straight lines. I tried using a digging technique to make lines but it wasn't giving me the appearance I wanted. So I switched to to straight lines and only digging in about a 16th of an inch and dragging it down about 3/4 of an inch. It worked for me.