'Streaks' in the Bible

And Jacob took him rods of fresh poplar, and of the almond and of the plane-tree. And peeled white streaks in them, and made the white appear which was in the rods.

and he shall look on the plague; and, behold, if the plague be in the walls of the house with hollow streaks, greenish or reddish, and the appearance thereof be lower than the wall;