| Archaeosigillaria had an exarch actinostele with scalariform and reticulate tracheids. |
| Vessel elements, tracheids, fibres, sieve tube elements, sieve cells, and parenchyma cells are the major components of vascular tissue. |
| Pits at the intersection fields of cells of radial parenchyma with longitudinal tracheids are pine-like type with small flanges. |
| In conifers, the tracheids, which account for most of the wood, give the tree rigidity and form most of the xylem. |
| In the rays, they operate as transverse tracheids transporting water and mineral nutrients in a radial direction. |
| Graniferous tracheary elements, which may be either tracheids or vessel members, have been observed most often in the haustoria of root-parasitic angiosperms. |
