I think other people are looking at the Medulary rays, because those do go across at an angle. The grain is hard to see in the pictures but the back is definately straight and the edge has straight grain where it is parallel( obviously it is going to be at an angle where the limb tapers now that I cut it). I think this is a case of wood having too much earlywood, I forgot to check the endgrain at the store because it came from a 10 foot board. Anyway, I backed it with brown paper like I usually do and I'll post it once it's finished.