Lignified cells in Lilium longiflorum Thunb. styles and their relation to bioelectric potential changes.

Cells with secondary wall thickenings are present in the style of Lilium longiflorum Thunb. cv. Arai 5. These cells are located just outside the three vascular bundles radial to the protophloem. The cells are not present everywhere but occur "at random" along the three vascular bundles. They are surrounded by small elongated parenchyma cells. The secondary wall is lignified but their lignification is less than that of the xylem cells. A relationship has been demonstrated between the presence of these cells and the registration of bioelectric potential changes.