original: The subunguis is the softer, flaky underside layer whose grain is parallel to the direction of growth.
simplifications: The subunguis is the softer, flaky underside layer.  The grain is parallel to the direction of growth. The subunguis is the softer layer with grain parallel to the direction of growth. The subunguis is the softer, flaky underside layer. The grain is parallel to the growth. The subunguis is the softer, flaky layer underneath. Its grain runs side by side to the direction of growth. The subunguis is the softer, flaky layer under. Its grain is in the same direction as the growth. Subunguis is the bottom layer that is softer and runs the same way as the growth. The subunguis is the softer underside layer. The subunguis is the softer, flaky underside layer whose grain is parallel to the growth direction. The subunguis is the softer, flaky underside layer. Its grain is parallel to the direction of growth. The subunguis is the softer, flaky underside layer. It's grain is parallel to the direction of growth.