Assertion: epidermis's cell | /r/HasProperty | thickened with lignin
Facets:
Source sentences:
text: Tracheid, in botany, primitive element of xylem (fluid-conducting tissues), consisting of a single elongated cell with pointed ends and a secondary, cellulosic wall thickened with lignin (a chemical binding substance) containing numerous pits but having no perforations in the primary cell wall.