The first time I came across and identified red oak (Quercus rubra) was in a Lincolnshire cemetery. Since that time I've come across this attractive North American species in many locations, both urban and rural. The photograph above features the trunk of a member of this species. I liked the semi-abstract appearance of the bark with the jagged verical slits that reveal a red inner, and the contrasting, cloud-like pale green and darker patches.
photo © T. Boughen Camera: Sony DSC-RX100