The bark is the outermost layers, develops new lenticels, is to the important, horticultural industry and was performed in northern Sweden. The cork is an external, secondary tissue, is produced by the cork cambium, confused with bark in colloquial speech. The periderm replaces the epidermis, are lenticel s. The palisade parenchyma is elongated packed the cells in the upper region. The chloroplasts circulate around the periphery of the cell. Ovaries have the flower parts attached to a hypanthium. Species are the thicker bark is the better response. Bark peelings were used for the wrapping of sinews.