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Polarization microscopy was used to examine the cause of hygroscopic movement in umbellet peduncles, or primary rays, of Daucus carota (Apiaceae). Net microfibril orientation of thick-walled parenchyma cells is perpendicular to the long axis of the cell. When the relative humidity rises, these parenchyma cells elongate. In contrast, net microfibril orientation of sclerified fibers is parallel to the long axis of the cell. These fibers do not elongate with increasing relative humidity. Becausedoi:10.1086/337385 fatcat:dxm3f2qki5clvfxogeo3d3jxvi