Smooth or suberous fracture of the external or purely cellular portion of the bark.
Ligneous fracture of the internal portion or liber.
This image is from _ in Pereira's Elements of Materia Medica and Therapeutics, 1854.
Henriette's Herbal Homepage
Welcome to the bark side.
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.