the world > plants > particular plants > trees and shrubs > tree or shrub groups > birch and allies > [noun] > bark, sap, or seed-pod (3)
Used by Turner, for the sap of the birch-tree.
Scottish. The seed-pod of the birch. (Jamieson.)
the bark of a birch-tree (also attributive); (U.S.) a birch-bark canoe.