Fig. 286. Mecca or Bussorah Galls.
a. Branch, bearing a gall. b. Section of a gall.
This image is from Gall or Dyer's Oak in Pereira's Elements of Materia Medica and Therapeutics, 1854.
A herbal distance course
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.