Puzzle pieces of the pines

The bark of the Ponderosa pine is not only fire resistant but beautiful. Younger trees are dark brown to black, but as the trees age their bark turns a gorgeous reddish brown. The bark forms intricate puzzle pieces that overlap and can flake off individually. This picture shows a mature Ponderosa pine with its extremely variegated patterns. Here is its classification from Wikipedia:
Kingdom: Plantae

Division: Pinophyta
Class: Pinopsida
Order: Pinales
Family: Pinaceae
Genus: Pinus
Subgenus: Pinus
Species: P. ponderosa