are tree rings secondary xylem or phloem
As dendrochronologists, we are more interested in the fusiform initials. The fusiform initials produce secondary xylem and secondary phloem (the xylem and phloem produced during secondary growth). When we study wood or tree rings, we are looking at secondary xylem.As the fusiform initials divide, they produce secondary xylem towards the inside of the cell and secondary phloem towards the outside. Therefore, the vascular cambium (where we find the fusiform initials) is considered to be bifacial.s dendrochronologists, we are more interested in the fusiform initials. The fusiform initials produce secondary xylem and secondary phloem (the xylem and phloem produced during secondary growth). When we study wood or tree rings, we are looking at secondary xylem.