Bark		hi-res links (requires broadband)
Curtis, Lersten, and Nowak 2002 rev. 2015

Fraxinus (ash) bark with lenticels.

Diospyros (persimmon) bark.

Ostrya (hop-hornbeam) bark.

Celtis (hackberry) bark with multiple periderm layers.

Celtis (hackberry) bark section showing multiple periderm layers.