part_of part of part of secondary xylem parenchyma ray secondary xylem parenchyma plant_anatomy A portion of secondary xylem parenchyma (PO:0004532) that is part of a ray system (PO:0025411) and has as parts ray secondary xylem parenchyma cells (PO:0004527). PO_GIT:455 Occurs in bands or rays of variable width and height that extend radially in the secondary xylem (PO:0005848) and secondary phloem (PO:0005043) of a plant axis (PO:0025004). PO:0004534 par&#233nquima de rayo de la madera (Spanish, exact) ray (broad) ray wood parenchyma (exact) 放射状二次木質部柔組織 (Japanese, exact) ray system