just.wing.it
Deadwood Head
Oh, yeah....great observation!The bark is different most likely because of soil erosion over the course of this tree's long life. What had been underground is being gradually exposed by the tree's growth and washing away of the soil--note the line of different tissue tilts down towards the slope behind the tree. Soil has been washing down that way for a couple of hundred years. The less fissured bark hasn't been exposed to the same elements as the bark above. Same holds true for root tissue on buried roots on bonsai...