What are the characteristic differences found in vascular tissue of gymnosperms

What are the characteristic differences found in vascular tissue of gymnosperms and angiosperms?

In gymnosperms, xylem vessels are not present in xylem, whereas, these are main constituents in angiosperms. In the phloem of gymnosperms, companion cells are not associated with the sieve elements. In angiosperms, companion cells are associated with the sieve elements of phloem.